6651664725 has 48 divisors (see below), whose sum is σ = 11303276544. Its totient is φ = 3449472000.

The previous prime is 6651664667. The next prime is 6651664729. The reversal of 6651664725 is 5274661566.

It is not a de Polignac number, because 6651664725 - 2⁷ = 6651664597 is a prime.

It is a super-2 number, since 2×6651664725² = 88489287227618651250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6651664729) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 959020 + ... + 965930.

It is an arithmetic number, because the mean of its divisors is an integer number (235484928).

Almost surely, 2^6651664725 is an apocalyptic number.

It is an amenable number.

6651664725 is a deficient number, since it is larger than the sum of its proper divisors (4651611819).

6651664725 is a wasteful number, since it uses less digits than its factorization.

6651664725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7278 (or 7273 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 48.

The square root of 6651664725 is about 81557.7385966531. The cubic root of 6651664725 is about 1880.6592607354.

The spelling of 6651664725 in words is "six billion, six hundred fifty-one million, six hundred sixty-four thousand, seven hundred twenty-five".