651601656 has 48 divisors (see below), whose sum is σ = 1857640200. Its totient is φ = 205768512.

The previous prime is 651601651. The next prime is 651601697. The reversal of 651601656 is 656106156.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 651601656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651601651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 236791 + ... + 239526.

Almost surely, 2^651601656 is an apocalyptic number.

It is an amenable number.

651601656 is an abundant number, since it is smaller than the sum of its proper divisors (1206038544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

651601656 is a wasteful number, since it uses less digits than its factorization.

651601656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476348 (or 476341 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 651601656 is about 25526.4893003327. The cubic root of 651601656 is about 866.9500176723.

The spelling of 651601656 in words is "six hundred fifty-one million, six hundred one thousand, six hundred fifty-six".