201691861734276 has 81 divisors (see below), whose sum is σ = 522579480899749. Its totient is φ = 65589713198400.

The previous prime is 201691861734269. The next prime is 201691861734283. The reversal of 201691861734276 is 672437168196102.

The square root of 201691861734276 is 14201826.

It is a perfect power (a square), and thus also a powerful number.

201691861734276 is a `hidden beast` number, since 2 + 0 + 1 + 6 + 9 + 1 + 8 + 617 + 3 + 4 + 2 + 7 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (201691861734269) and next prime (201691861734283).

It can be written as a sum of positive squares in only one way, i.e., 9718644140676 + 191973217593600 = 3117474^2 + 13855440^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3493620331 + ... + 3493678061.

Almost surely, 2^{201691861734276} is an apocalyptic number.

201691861734276 is the 14201826-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201691861734276

201691861734276 is an abundant number, since it is smaller than the sum of its proper divisors (320887619165473).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201691861734276 is an frugal number, since it uses more digits than its factorization.

201691861734276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115554 (or 57777 counting only the distinct ones).

The product of its (nonzero) digits is 36578304, while the sum is 63.

The spelling of 201691861734276 in words is "two hundred one trillion, six hundred ninety-one billion, eight hundred sixty-one million, seven hundred thirty-four thousand, two hundred seventy-six".