656406077 has 4 divisors (see below), whose sum is σ = 659704800. Its totient is φ = 653107356.

The previous prime is 656406041. The next prime is 656406083. The reversal of 656406077 is 770604656.

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 656406077 - 2⁸ = 656405821 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 (656406577) 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, 1649063 + ... + 1649460.

It is an arithmetic number, because the mean of its divisors is an integer number (164926200).

Almost surely, 2^656406077 is an apocalyptic number.

It is an amenable number.

656406077 is a deficient number, since it is larger than the sum of its proper divisors (3298723).

656406077 is a wasteful number, since it uses less digits than its factorization.

656406077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3298722.

The product of its (nonzero) digits is 211680, while the sum is 41.

The square root of 656406077 is about 25620.4230449070. The cubic root of 656406077 is about 869.0755481811.

It can be divided in two parts, 65640 and 6077, that added together give a palindrome (71717).

The spelling of 656406077 in words is "six hundred fifty-six million, four hundred six thousand, seventy-seven".