3977666525 has 12 divisors (see below), whose sum is σ = 5636921952. Its totient is φ = 2727542640.

The previous prime is 3977666507. The next prime is 3977666531. The reversal of 3977666525 is 5256667793.

It is not a de Polignac number, because 3977666525 - 2⁸ = 3977666269 is a prime.

It is a Duffinian number.

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, 11364587 + ... + 11364936.

It is an arithmetic number, because the mean of its divisors is an integer number (469743496).

Almost surely, 2^3977666525 is an apocalyptic number.

3977666525 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3977666525 is a deficient number, since it is larger than the sum of its proper divisors (1659255427).

3977666525 is a wasteful number, since it uses less digits than its factorization.

3977666525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22729540 (or 22729535 counting only the distinct ones).

The product of its digits is 14288400, while the sum is 56.

The square root of 3977666525 is about 63068.7444381129. The cubic root of 3977666525 is about 1584.4411879677.

The spelling of 3977666525 in words is "three billion, nine hundred seventy-seven million, six hundred sixty-six thousand, five hundred twenty-five".