3977661525 has 12 divisors (see below), whose sum is σ = 6576400512. Its totient is φ = 2121419440.

The previous prime is 3977661509. The next prime is 3977661563. The reversal of 3977661525 is 5251667793.

3977661525 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3977661525 - 2⁴ = 3977661509 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26517669 + ... + 26517818.

It is an arithmetic number, because the mean of its divisors is an integer number (548033376).

Almost surely, 2^3977661525 is an apocalyptic number.

It is an amenable number.

3977661525 is a deficient number, since it is larger than the sum of its proper divisors (2598738987).

3977661525 is a wasteful number, since it uses less digits than its factorization.

3977661525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53035500 (or 53035495 counting only the distinct ones).

The product of its digits is 2381400, while the sum is 51.

The square root of 3977661525 is about 63068.7047988144. The cubic root of 3977661525 is about 1584.4405240768.

The spelling of 3977661525 in words is "three billion, nine hundred seventy-seven million, six hundred sixty-one thousand, five hundred twenty-five".