155997964 has 12 divisors (see below), whose sum is σ = 273454888. Its totient is φ = 77868000.

The previous prime is 155997943. The next prime is 155997971. The reversal of 155997964 is 469799551.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30042 + ... + 34849.

Almost surely, 2^155997964 is an apocalyptic number.

It is an amenable number.

155997964 is a deficient number, since it is larger than the sum of its proper divisors (117456924).

155997964 is a wasteful number, since it uses less digits than its factorization.

155997964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65496 (or 65494 counting only the distinct ones).

The product of its digits is 3061800, while the sum is 55.

The square root of 155997964 is about 12489.9144913006. The cubic root of 155997964 is about 538.3189192710.

The spelling of 155997964 in words is "one hundred fifty-five million, nine hundred ninety-seven thousand, nine hundred sixty-four".