56877207421 has 4 divisors (see below), whose sum is σ = 57950362332. Its totient is φ = 55804052512.

The previous prime is 56877207407. The next prime is 56877207467. The reversal of 56877207421 is 12470277865.

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 32980376025 + 23896831396 = 181605^2 + 154586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56877207421 is a prime.

It is a super-3 number, since 3×56877207421³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56877207481) 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, 536577376 + ... + 536577481.

It is an arithmetic number, because the mean of its divisors is an integer number (14487590583).

Almost surely, 2^56877207421 is an apocalyptic number.

It is an amenable number.

56877207421 is a deficient number, since it is larger than the sum of its proper divisors (1073154911).

56877207421 is a wasteful number, since it uses less digits than its factorization.

56877207421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073154910.

The product of its (nonzero) digits is 1317120, while the sum is 49.

The spelling of 56877207421 in words is "fifty-six billion, eight hundred seventy-seven million, two hundred seven thousand, four hundred twenty-one".