377916561 has 12 divisors (see below), whose sum is σ = 595505040. Its totient is φ = 229040280.

The previous prime is 377916541. The next prime is 377916571. The reversal of 377916561 is 165619773.

377916561 is a `hidden beast` number, since 3 + 7 + 79 + 16 + 561 = 666.

It is not a de Polignac number, because 377916561 - 2⁷ = 377916433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (377916521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1908571 + ... + 1908768.

It is an arithmetic number, because the mean of its divisors is an integer number (49625420).

Almost surely, 2^377916561 is an apocalyptic number.

It is an amenable number.

377916561 is a deficient number, since it is larger than the sum of its proper divisors (217588479).

377916561 is a wasteful number, since it uses less digits than its factorization.

377916561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3817356 (or 3817353 counting only the distinct ones).

The product of its digits is 238140, while the sum is 45.

The square root of 377916561 is about 19440.0761572582. The cubic root of 377916561 is about 722.9894743163.

The spelling of 377916561 in words is "three hundred seventy-seven million, nine hundred sixteen thousand, five hundred sixty-one".