577516661 has 4 divisors (see below), whose sum is σ = 581059872. Its totient is φ = 573973452.

The previous prime is 577516657. The next prime is 577516669. The reversal of 577516661 is 166615775.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 577516661 - 2² = 577516657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (577516669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1771361 + ... + 1771686.

It is an arithmetic number, because the mean of its divisors is an integer number (145264968).

Almost surely, 2^577516661 is an apocalyptic number.

It is an amenable number.

577516661 is a deficient number, since it is larger than the sum of its proper divisors (3543211).

577516661 is a wasteful number, since it uses less digits than its factorization.

577516661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3543210.

The product of its digits is 264600, while the sum is 44.

The square root of 577516661 is about 24031.5763319846. The cubic root of 577516661 is about 832.7631628112.

The spelling of 577516661 in words is "five hundred seventy-seven million, five hundred sixteen thousand, six hundred sixty-one".