691861202151 has 8 divisors (see below), whose sum is σ = 1054264689024. Its totient is φ = 395349258360.

The previous prime is 691861202143. The next prime is 691861202167. The reversal of 691861202151 is 151202168196.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 691861202151 - 2³ = 691861202143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691861202171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16472885745 + ... + 16472885786.

It is an arithmetic number, because the mean of its divisors is an integer number (131783086128).

Almost surely, 2^691861202151 is an apocalyptic number.

691861202151 is a deficient number, since it is larger than the sum of its proper divisors (362403486873).

691861202151 is a wasteful number, since it uses less digits than its factorization.

691861202151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32945771541.

The product of its (nonzero) digits is 51840, while the sum is 42.

The spelling of 691861202151 in words is "six hundred ninety-one billion, eight hundred sixty-one million, two hundred two thousand, one hundred fifty-one".