61551451444 has 24 divisors (see below), whose sum is σ = 129582004160. Its totient is φ = 24990814656.

The previous prime is 61551451441. The next prime is 61551451453. The reversal of 61551451444 is 44415415516.

It is a junction number, because it is equal to n+sod(n) for n = 61551451397 and 61551451406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61551451441) 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, 57848577 + ... + 57849640.

Almost surely, 2^61551451444 is an apocalyptic number.

It is an amenable number.

61551451444 is an abundant number, since it is smaller than the sum of its proper divisors (68030552716).

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

61551451444 is a wasteful number, since it uses less digits than its factorization.

61551451444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115698247 (or 115698245 counting only the distinct ones).

The product of its digits is 192000, while the sum is 40.

The spelling of 61551451444 in words is "sixty-one billion, five hundred fifty-one million, four hundred fifty-one thousand, four hundred forty-four".