151721656 has 8 divisors (see below), whose sum is σ = 284478120. Its totient is φ = 75860824.

The previous prime is 151721623. The next prime is 151721681. The reversal of 151721656 is 656127151.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9482596 + ... + 9482611.

It is an arithmetic number, because the mean of its divisors is an integer number (35559765).

Almost surely, 2^151721656 is an apocalyptic number.

It is an amenable number.

151721656 is a deficient number, since it is larger than the sum of its proper divisors (132756464).

151721656 is a wasteful number, since it uses less digits than its factorization.

151721656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18965213 (or 18965209 counting only the distinct ones).

The product of its digits is 12600, while the sum is 34.

The square root of 151721656 is about 12317.5344935584. The cubic root of 151721656 is about 533.3543703508.

The spelling of 151721656 in words is "one hundred fifty-one million, seven hundred twenty-one thousand, six hundred fifty-six".