56621278067 has 4 divisors (see below), whose sum is σ = 56662699536. Its totient is φ = 56579856600.

The previous prime is 56621278037. The next prime is 56621278079. The reversal of 56621278067 is 76087212665.

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

It is not a de Polignac number, because 56621278067 - 2¹² = 56621273971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56621278037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20708684 + ... + 20711417.

It is an arithmetic number, because the mean of its divisors is an integer number (14165674884).

Almost surely, 2^56621278067 is an apocalyptic number.

56621278067 is a deficient number, since it is larger than the sum of its proper divisors (41421469).

56621278067 is a wasteful number, since it uses less digits than its factorization.

56621278067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41421468.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 56621278067 in words is "fifty-six billion, six hundred twenty-one million, two hundred seventy-eight thousand, sixty-seven".