201261644523 has 24 divisors (see below), whose sum is σ = 299442091520. Its totient is φ = 130186148400.

The previous prime is 201261644501. The next prime is 201261644567. The reversal of 201261644523 is 325446162102.

201261644523 is a `hidden beast` number, since 2 + 0 + 1 + 2 + 6 + 1 + 644 + 5 + 2 + 3 = 666.

It is not a de Polignac number, because 201261644523 - 2⁶ = 201261644459 is a prime.

It is a super-2 number, since 2×201261644523² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201261644123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1663603 + ... + 1780476.

Almost surely, 2^201261644523 is an apocalyptic number.

201261644523 is a deficient number, since it is larger than the sum of its proper divisors (98180446997).

201261644523 is a wasteful number, since it uses less digits than its factorization.

201261644523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3444279 (or 3444276 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 201261644523 in words is "two hundred one billion, two hundred sixty-one million, six hundred forty-four thousand, five hundred twenty-three".