61767221564 has 6 divisors (see below), whose sum is σ = 108092637744. Its totient is φ = 30883610780.

The previous prime is 61767221563. The next prime is 61767221573. The reversal of 61767221564 is 46512276716.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61767221561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7720902692 + ... + 7720902699.

It is an arithmetic number, because the mean of its divisors is an integer number (18015439624).

Almost surely, 2^61767221564 is an apocalyptic number.

It is an amenable number.

61767221564 is a deficient number, since it is larger than the sum of its proper divisors (46325416180).

61767221564 is a wasteful number, since it uses less digits than its factorization.

61767221564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15441805395 (or 15441805393 counting only the distinct ones).

The product of its digits is 846720, while the sum is 47.

The spelling of 61767221564 in words is "sixty-one billion, seven hundred sixty-seven million, two hundred twenty-one thousand, five hundred sixty-four".