156668957 has 4 divisors (see below), whose sum is σ = 165884796. Its totient is φ = 147453120.

The previous prime is 156668951. The next prime is 156668959. The reversal of 156668957 is 759866651.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53158681 + 103510276 = 7291^2 + 10174^2 .

It is a cyclic number.

It is not a de Polignac number, because 156668957 - 2²² = 152474653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 156668899 and 156668908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156668951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4607894 + ... + 4607927.

It is an arithmetic number, because the mean of its divisors is an integer number (41471199).

Almost surely, 2^156668957 is an apocalyptic number.

156668957 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

156668957 is a deficient number, since it is larger than the sum of its proper divisors (9215839).

156668957 is an equidigital number, since it uses as much as digits as its factorization.

156668957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9215838.

The product of its digits is 2721600, while the sum is 53.

The square root of 156668957 is about 12516.7470614373. The cubic root of 156668957 is about 539.0896378194.

The spelling of 156668957 in words is "one hundred fifty-six million, six hundred sixty-eight thousand, nine hundred fifty-seven".