221791761544 has 16 divisors (see below), whose sum is σ = 416197393920. Its totient is φ = 110805789840.

The previous prime is 221791761487. The next prime is 221791761551. The reversal of 221791761544 is 445167197122.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11250904 + ... + 11270599.

It is an arithmetic number, because the mean of its divisors is an integer number (26012337120).

Almost surely, 2^221791761544 is an apocalyptic number.

It is an amenable number.

221791761544 is a deficient number, since it is larger than the sum of its proper divisors (194405632376).

221791761544 is a wasteful number, since it uses less digits than its factorization.

221791761544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22522740 (or 22522736 counting only the distinct ones).

The product of its digits is 846720, while the sum is 49.

The spelling of 221791761544 in words is "two hundred twenty-one billion, seven hundred ninety-one million, seven hundred sixty-one thousand, five hundred forty-four".