3977997555 has 32 divisors (see below), whose sum is σ = 7301145600. Its totient is φ = 1811740032.

The previous prime is 3977997487. The next prime is 3977997563. The reversal of 3977997555 is 5557997793.

It is not a de Polignac number, because 3977997555 - 2²⁰ = 3976948979 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42175 + ... + 98664.

It is an arithmetic number, because the mean of its divisors is an integer number (228160800).

Almost surely, 2^3977997555 is an apocalyptic number.

3977997555 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

3977997555 is a deficient number, since it is larger than the sum of its proper divisors (3323148045).

3977997555 is a wasteful number, since it uses less digits than its factorization.

3977997555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141123.

The product of its digits is 93767625, while the sum is 66.

The square root of 3977997555 is about 63071.3687420845. The cubic root of 3977997555 is about 1584.4851402878.

The spelling of 3977997555 in words is "three billion, nine hundred seventy-seven million, nine hundred ninety-seven thousand, five hundred fifty-five".