56666126566251 has 24 divisors (see below), whose sum is σ = 84070005377280. Its totient is φ = 36753458265216.

The previous prime is 56666126566241. The next prime is 56666126566261. The reversal of 56666126566251 is 15266562166665.

It is an interprime number because it is at equal distance from previous prime (56666126566241) and next prime (56666126566261).

It is not a de Polignac number, because 56666126566251 - 2⁶ = 56666126566187 is a prime.

It is a super-2 number, since 2×56666126566251² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (56666126566241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2662690 + ... + 10973703.

It is an arithmetic number, because the mean of its divisors is an integer number (3502916890720).

Almost surely, 2^{56666126566251} is an apocalyptic number.

56666126566251 is a deficient number, since it is larger than the sum of its proper divisors (27403878811029).

56666126566251 is a wasteful number, since it uses less digits than its factorization.

56666126566251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13648915 (or 13648912 counting only the distinct ones).

The product of its digits is 139968000, while the sum is 63.

The spelling of 56666126566251 in words is "fifty-six trillion, six hundred sixty-six billion, one hundred twenty-six million, five hundred sixty-six thousand, two hundred fifty-one".