651065666550 has 48 divisors (see below), whose sum is σ = 1738846154640. Its totient is φ = 160262317440.

The previous prime is 651065666533. The next prime is 651065666591. The reversal of 651065666550 is 55666560156.

It is a junction number, because it is equal to n+sod(n) for n = 651065666493 and 651065666502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 166937965 + ... + 166941864.

It is an arithmetic number, because the mean of its divisors is an integer number (36225961555).

Almost surely, 2^651065666550 is an apocalyptic number.

651065666550 is an abundant number, since it is smaller than the sum of its proper divisors (1087780488090).

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

651065666550 is a wasteful number, since it uses less digits than its factorization.

651065666550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333879857 (or 333879852 counting only the distinct ones).

The product of its (nonzero) digits is 4860000, while the sum is 51.

The spelling of 651065666550 in words is "six hundred fifty-one billion, sixty-five million, six hundred sixty-six thousand, five hundred fifty".