156798665680 has 20 divisors (see below), whose sum is σ = 364556897892. Its totient is φ = 62719466240.

The previous prime is 156798665651. The next prime is 156798665801. The reversal of 156798665680 is 86566897651.

It can be written as a sum of positive squares in 2 ways, for example, as 61050503056 + 95748162624 = 247084^2 + 309432^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 979991581 + ... + 979991740.

Almost surely, 2^156798665680 is an apocalyptic number.

156798665680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

156798665680 is an abundant number, since it is smaller than the sum of its proper divisors (207758232212).

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

156798665680 is a wasteful number, since it uses less digits than its factorization.

156798665680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1959983334 (or 1959983328 counting only the distinct ones).

The product of its (nonzero) digits is 130636800, while the sum is 67.

The spelling of 156798665680 in words is "one hundred fifty-six billion, seven hundred ninety-eight million, six hundred sixty-five thousand, six hundred eighty".