256606552061771 has 4 divisors (see below), whose sum is σ = 256793446857072. Its totient is φ = 256419657266472.

The previous prime is 256606552061767. The next prime is 256606552061773. The reversal of 256606552061771 is 177160255606652.

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

It is a cyclic number.

It is not a de Polignac number, because 256606552061771 - 2² = 256606552061767 is a prime.

It is a super-2 number, since 2×256606552061771² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256606552061771.

It is not an unprimeable number, because it can be changed into a prime (256606552061773) 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, 93447395591 + ... + 93447398336.

It is an arithmetic number, because the mean of its divisors is an integer number (64198361714268).

Almost surely, 2^{256606552061771} is an apocalyptic number.

256606552061771 is a deficient number, since it is larger than the sum of its proper divisors (186894795301).

256606552061771 is a wasteful number, since it uses less digits than its factorization.

256606552061771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186894795300.

The product of its (nonzero) digits is 31752000, while the sum is 59.

The spelling of 256606552061771 in words is "two hundred fifty-six trillion, six hundred six billion, five hundred fifty-two million, sixty-one thousand, seven hundred seventy-one".