156991964 has 24 divisors (see below), whose sum is σ = 285888960. Its totient is φ = 75341504.

The previous prime is 156991949. The next prime is 156992009. The reversal of 156991964 is 469199651.

156991964 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16157 + ... + 23979.

It is an arithmetic number, because the mean of its divisors is an integer number (11912040).

Almost surely, 2^156991964 is an apocalyptic number.

It is an amenable number.

156991964 is a deficient number, since it is larger than the sum of its proper divisors (128896996).

156991964 is a wasteful number, since it uses less digits than its factorization.

156991964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8029 (or 8027 counting only the distinct ones).

The product of its digits is 524880, while the sum is 50.

The square root of 156991964 is about 12529.6434107280. The cubic root of 156991964 is about 539.4598668640.

The spelling of 156991964 in words is "one hundred fifty-six million, nine hundred ninety-one thousand, nine hundred sixty-four".