61737318318 has 64 divisors (see below), whose sum is σ = 135067161600. Its totient is φ = 18698359680.

The previous prime is 61737318311. The next prime is 61737318319. The reversal of 61737318318 is 81381373716.

It is a super-2 number, since 2×61737318318² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61737318311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2024488 + ... + 2054756.

It is an arithmetic number, because the mean of its divisors is an integer number (2110424400).

Almost surely, 2^61737318318 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61737318318, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67533580800).

61737318318 is an abundant number, since it is smaller than the sum of its proper divisors (73329843282).

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

61737318318 is a wasteful number, since it uses less digits than its factorization.

61737318318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30697.

The product of its digits is 508032, while the sum is 48.

The spelling of 61737318318 in words is "sixty-one billion, seven hundred thirty-seven million, three hundred eighteen thousand, three hundred eighteen".