556406761 has 4 divisors (see below), whose sum is σ = 556780932. Its totient is φ = 556032592.

The previous prime is 556406749. The next prime is 556406771. The reversal of 556406761 is 167604655.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 291726400 + 264680361 = 17080^2 + 16269^2 .

It is a cyclic number.

It is not a de Polignac number, because 556406761 - 2²³ = 548018153 is a prime.

It is a super-2 number, since 2×556406761² = 619176967373022242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (556406701) 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, 184846 + ... + 187831.

It is an arithmetic number, because the mean of its divisors is an integer number (139195233).

Almost surely, 2^556406761 is an apocalyptic number.

It is an amenable number.

556406761 is a deficient number, since it is larger than the sum of its proper divisors (374171).

556406761 is a wasteful number, since it uses less digits than its factorization.

556406761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374170.

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 556406761 is about 23588.2759225849. The cubic root of 556406761 is about 822.4903278273.

The spelling of 556406761 in words is "five hundred fifty-six million, four hundred six thousand, seven hundred sixty-one".