56145514621 has 14 divisors (see below), whose sum is σ = 65503158110. Its totient is φ = 48124625976.

The previous prime is 56145514619. The next prime is 56145514657. The reversal of 56145514621 is 12641554165.

It can be written as a sum of positive squares in only one way, i.e., 46251233721 + 9894280900 = 215061^2 + 99470^2 .

It is not a de Polignac number, because 56145514621 - 2¹ = 56145514619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56145511621) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 120966 + ... + 356263.

Almost surely, 2^56145514621 is an apocalyptic number.

It is an amenable number.

56145514621 is a deficient number, since it is larger than the sum of its proper divisors (9357643489).

56145514621 is an frugal number, since it uses more digits than its factorization.

56145514621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477271 (or 477236 counting only the distinct ones).

The product of its digits is 144000, while the sum is 40.

The spelling of 56145514621 in words is "fifty-six billion, one hundred forty-five million, five hundred fourteen thousand, six hundred twenty-one".