151785640656 has 60 divisors (see below), whose sum is σ = 457465061508. Its totient is φ = 46703273472.

The previous prime is 151785640639. The next prime is 151785640673. The reversal of 151785640656 is 656046587151.

151785640656 is a `hidden beast` number, since 1 + 5 + 1 + 78 + 564 + 0 + 6 + 5 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (151785640639) and next prime (151785640673).

It can be written as a sum of positive squares in 2 ways, for example, as 13669351056 + 138116289600 = 116916^2 + 371640^2 .

It is a super-2 number, since 2×151785640656² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40539165 + ... + 40542908.

Almost surely, 2^151785640656 is an apocalyptic number.

151785640656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

151785640656 is an abundant number, since it is smaller than the sum of its proper divisors (305679420852).

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

151785640656 is a wasteful number, since it uses less digits than its factorization.

151785640656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81082100 (or 81082091 counting only the distinct ones).

The product of its (nonzero) digits is 6048000, while the sum is 54.

The spelling of 151785640656 in words is "one hundred fifty-one billion, seven hundred eighty-five million, six hundred forty thousand, six hundred fifty-six".