61172891934 has 96 divisors (see below), whose sum is σ = 157804578432. Its totient is φ = 15628536000.

The previous prime is 61172891921. The next prime is 61172891947. The reversal of 61172891934 is 43919827116.

It is an interprime number because it is at equal distance from previous prime (61172891921) and next prime (61172891947).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 42229 + ... + 352319.

It is an arithmetic number, because the mean of its divisors is an integer number (1643797692).

Almost surely, 2^61172891934 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61172891934, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78902289216).

61172891934 is an abundant number, since it is smaller than the sum of its proper divisors (96631686498).

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

61172891934 is a wasteful number, since it uses less digits than its factorization.

61172891934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310182 (or 310175 counting only the distinct ones).

The product of its digits is 653184, while the sum is 51.

The spelling of 61172891934 in words is "sixty-one billion, one hundred seventy-two million, eight hundred ninety-one thousand, nine hundred thirty-four".