6651564057 has 6 divisors (see below), whose sum is σ = 9607814762. Its totient is φ = 4434376032.

The previous prime is 6651564053. The next prime is 6651564067. The reversal of 6651564057 is 7504651566.

It can be written as a sum of positive squares in only one way, i.e., 6647303961 + 4260096 = 81531^2 + 2064^2 .

It is not a de Polignac number, because 6651564057 - 2² = 6651564053 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6651564053) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 369531328 + ... + 369531345.

Almost surely, 2^6651564057 is an apocalyptic number.

It is an amenable number.

6651564057 is a deficient number, since it is larger than the sum of its proper divisors (2956250705).

6651564057 is a wasteful number, since it uses less digits than its factorization.

6651564057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739062679 (or 739062676 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 45.

The square root of 6651564057 is about 81557.1214364509. The cubic root of 6651564057 is about 1880.6497732277.

The spelling of 6651564057 in words is "six billion, six hundred fifty-one million, five hundred sixty-four thousand, fifty-seven".