155621656 has 32 divisors (see below), whose sum is σ = 304722000. Its totient is φ = 74413696.

The previous prime is 155621651. The next prime is 155621681. The reversal of 155621656 is 656126551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155621651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21690 + ... + 27958.

Almost surely, 2^155621656 is an apocalyptic number.

It is an amenable number.

155621656 is a deficient number, since it is larger than the sum of its proper divisors (149100344).

155621656 is a wasteful number, since it uses less digits than its factorization.

155621656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6411 (or 6407 counting only the distinct ones).

The product of its digits is 54000, while the sum is 37.

The square root of 155621656 is about 12474.8409208294. The cubic root of 155621656 is about 537.8857152806.

The spelling of 155621656 in words is "one hundred fifty-five million, six hundred twenty-one thousand, six hundred fifty-six".