61654221888 has 56 divisors (see below), whose sum is σ = 186430627392. Its totient is φ = 17615491584.

The previous prime is 61654221887. The next prime is 61654221901. The reversal of 61654221888 is 88812245616.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×61654221888² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61654221888.

It is not an unprimeable number, because it can be changed into a prime (61654221883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22935495 + ... + 22938182.

Almost surely, 2^61654221888 is an apocalyptic number.

It is an amenable number.

61654221888 is an abundant number, since it is smaller than the sum of its proper divisors (124776405504).

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

61654221888 is a wasteful number, since it uses less digits than its factorization.

61654221888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45873699 (or 45873689 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 51.

The spelling of 61654221888 in words is "sixty-one billion, six hundred fifty-four million, two hundred twenty-one thousand, eight hundred eighty-eight".