6656649976 has 16 divisors (see below), whose sum is σ = 12485358000. Its totient is φ = 3327221184.

The previous prime is 6656649973. The next prime is 6656650027. The reversal of 6656649976 is 6799466566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6656649971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112060 + ... + 160843.

It is an arithmetic number, because the mean of its divisors is an integer number (780334875).

Almost surely, 2^6656649976 is an apocalyptic number.

It is an amenable number.

6656649976 is a deficient number, since it is larger than the sum of its proper divisors (5828708024).

6656649976 is a wasteful number, since it uses less digits than its factorization.

6656649976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275958 (or 275954 counting only the distinct ones).

The product of its digits is 88179840, while the sum is 64.

The square root of 6656649976 is about 81588.2955821483. The cubic root of 6656649976 is about 1881.1289785969.

The spelling of 6656649976 in words is "six billion, six hundred fifty-six million, six hundred forty-nine thousand, nine hundred seventy-six".