3997772657 has 4 divisors (see below), whose sum is σ = 4052536740. Its totient is φ = 3943008576.

The previous prime is 3997772629. The next prime is 3997772689. The reversal of 3997772657 is 7562777993.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3424122256 + 573650401 = 58516^2 + 23951^2 .

It is a cyclic number.

It is not a de Polignac number, because 3997772657 - 2⁶ = 3997772593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3997772657.

It is not an unprimeable number, because it can be changed into a prime (3997772257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27381932 + ... + 27382077.

It is an arithmetic number, because the mean of its divisors is an integer number (1013134185).

Almost surely, 2^3997772657 is an apocalyptic number.

It is an amenable number.

3997772657 is a deficient number, since it is larger than the sum of its proper divisors (54764083).

3997772657 is an equidigital number, since it uses as much as digits as its factorization.

3997772657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54764082.

The product of its digits is 35006580, while the sum is 62.

The square root of 3997772657 is about 63227.9420588714. The cubic root of 3997772657 is about 1587.1063567107.

The spelling of 3997772657 in words is "three billion, nine hundred ninety-seven million, seven hundred seventy-two thousand, six hundred fifty-seven".