61472221644 has 48 divisors (see below), whose sum is σ = 145457085312. Its totient is φ = 20202118272.

The previous prime is 61472221637. The next prime is 61472221757. The reversal of 61472221644 is 44612227416.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2478127 + ... + 2502809.

It is an arithmetic number, because the mean of its divisors is an integer number (3030355944).

Almost surely, 2^61472221644 is an apocalyptic number.

It is an amenable number.

61472221644 is an abundant number, since it is smaller than the sum of its proper divisors (83984863668).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61472221644 is a wasteful number, since it uses less digits than its factorization.

61472221644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27606 (or 27604 counting only the distinct ones).

The product of its digits is 129024, while the sum is 39.

The spelling of 61472221644 in words is "sixty-one billion, four hundred seventy-two million, two hundred twenty-one thousand, six hundred forty-four".