651606655 has 24 divisors (see below), whose sum is σ = 940965120. Its totient is φ = 431403840.

The previous prime is 651606643. The next prime is 651606671. The reversal of 651606655 is 556606156.

It is not a de Polignac number, because 651606655 - 2¹¹ = 651604607 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38751 + ... + 52960.

It is an arithmetic number, because the mean of its divisors is an integer number (39206880).

Almost surely, 2^651606655 is an apocalyptic number.

651606655 is a deficient number, since it is larger than the sum of its proper divisors (289358465).

651606655 is a wasteful number, since it uses less digits than its factorization.

651606655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91759 (or 91752 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 651606655 is about 25526.5872180360. The cubic root of 651606655 is about 866.9522347078.

The spelling of 651606655 in words is "six hundred fifty-one million, six hundred six thousand, six hundred fifty-five".