61989077181 has 16 divisors (see below), whose sum is σ = 85841745920. Its totient is φ = 39747587760.

The previous prime is 61989077173. The next prime is 61989077191. The reversal of 61989077181 is 18177098916.

It is not a de Polignac number, because 61989077181 - 2³ = 61989077173 is a prime.

It is a super-2 number, since 2×61989077181² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61989077191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2029471 + ... + 2059788.

It is an arithmetic number, because the mean of its divisors is an integer number (5365109120).

Almost surely, 2^61989077181 is an apocalyptic number.

It is an amenable number.

61989077181 is a deficient number, since it is larger than the sum of its proper divisors (23852668739).

61989077181 is a wasteful number, since it uses less digits than its factorization.

61989077181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4089456.

The product of its (nonzero) digits is 1524096, while the sum is 57.

The spelling of 61989077181 in words is "sixty-one billion, nine hundred eighty-nine million, seventy-seven thousand, one hundred eighty-one".