61372943181 has 24 divisors (see below), whose sum is σ = 97267918176. Its totient is φ = 36980708640.

The previous prime is 61372943179. The next prime is 61372943197. The reversal of 61372943181 is 18134927316.

61372943181 is a `hidden beast` number, since 6 + 137 + 2 + 9 + 431 + 81 = 666.

61372943181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61372943181 - 2¹ = 61372943179 is a prime.

It is a super-2 number, since 2×61372943181² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61372943101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1774575 + ... + 1808828.

It is an arithmetic number, because the mean of its divisors is an integer number (4052829924).

Almost surely, 2^61372943181 is an apocalyptic number.

It is an amenable number.

61372943181 is a deficient number, since it is larger than the sum of its proper divisors (35894974995).

61372943181 is a wasteful number, since it uses less digits than its factorization.

61372943181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3583593 (or 3583590 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The spelling of 61372943181 in words is "sixty-one billion, three hundred seventy-two million, nine hundred forty-three thousand, one hundred eighty-one".