156908677689 has 63 divisors (see below), whose sum is σ = 250197898783. Its totient is φ = 98338421952.

The previous prime is 156908677669. The next prime is 156908677703. The reversal of 156908677689 is 986776809651.

The square root of 156908677689 is 396117.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 122160735225 + 34747942464 = 349515^2 + 186408^2 .

It is not a de Polignac number, because 156908677689 - 2¹³ = 156908669497 is a prime.

It is a super-2 number, since 2×156908677689² (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 (156908677619) 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 62 ways as a sum of consecutive naturals, for example, 181817272 + ... + 181818134.

Almost surely, 2^156908677689 is an apocalyptic number.

156908677689 is the 396117-th square number.

156908677689 is the 198059-th centered octagonal number.

It is an amenable number.

156908677689 is a deficient number, since it is larger than the sum of its proper divisors (93289221094).

156908677689 is an frugal number, since it uses more digits than its factorization.

156908677689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1778 (or 883 counting only the distinct ones).

The product of its (nonzero) digits is 274337280, while the sum is 72.

The spelling of 156908677689 in words is "one hundred fifty-six billion, nine hundred eight million, six hundred seventy-seven thousand, six hundred eighty-nine".