156121500645 has 72 divisors (see below), whose sum is σ = 313598731680. Its totient is φ = 71242544640.

The previous prime is 156121500641. The next prime is 156121500701. The reversal of 156121500645 is 546005121651.

156121500645 is a `hidden beast` number, since 1 + 5 + 6 + 1 + 2 + 1 + 5 + 0 + 0 + 645 = 666.

It is not a de Polignac number, because 156121500645 - 2² = 156121500641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156121500641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 402615 + ... + 688724.

It is an arithmetic number, because the mean of its divisors is an integer number (4355537940).

Almost surely, 2^156121500645 is an apocalyptic number.

156121500645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

156121500645 is an abundant number, since it is smaller than the sum of its proper divisors (157477231035).

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

156121500645 is a wasteful number, since it uses less digits than its factorization.

156121500645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091395 (or 1091375 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The spelling of 156121500645 in words is "one hundred fifty-six billion, one hundred twenty-one million, five hundred thousand, six hundred forty-five".