56197781377 has 16 divisors (see below), whose sum is σ = 59440965120. Its totient is φ = 53025192000.

The previous prime is 56197781369. The next prime is 56197781383. The reversal of 56197781377 is 77318779165.

It is a cyclic number.

It is not a de Polignac number, because 56197781377 - 2³ = 56197781369 is a prime.

It is a super-2 number, since 2×56197781377² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56197781327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 584899 + ... + 674167.

It is an arithmetic number, because the mean of its divisors is an integer number (3715060320).

Almost surely, 2^56197781377 is an apocalyptic number.

It is an amenable number.

56197781377 is a deficient number, since it is larger than the sum of its proper divisors (3243183743).

56197781377 is a wasteful number, since it uses less digits than its factorization.

56197781377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89664.

The product of its digits is 15558480, while the sum is 61.

The spelling of 56197781377 in words is "fifty-six billion, one hundred ninety-seven million, seven hundred eighty-one thousand, three hundred seventy-seven".