651155656 has 8 divisors (see below), whose sum is σ = 1220916870. Its totient is φ = 325577824.

The previous prime is 651155633. The next prime is 651155717. The reversal of 651155656 is 656551156.

It can be written as a sum of positive squares in only one way, i.e., 431226756 + 219928900 = 20766^2 + 14830^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40697221 + ... + 40697236.

Almost surely, 2^651155656 is an apocalyptic number.

It is an amenable number.

651155656 is a deficient number, since it is larger than the sum of its proper divisors (569761214).

651155656 is a wasteful number, since it uses less digits than its factorization.

651155656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81394463 (or 81394459 counting only the distinct ones).

The product of its digits is 135000, while the sum is 40.

The square root of 651155656 is about 25517.7517818479. The cubic root of 651155656 is about 866.7521728917.

The spelling of 651155656 in words is "six hundred fifty-one million, one hundred fifty-five thousand, six hundred fifty-six".