61631605343220 has 96 divisors (see below), whose sum is σ = 192848162967936. Its totient is φ = 14576580710400.

The previous prime is 61631605343197. The next prime is 61631605343221. The reversal of 61631605343220 is 2234350613616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61631605343221) 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, 1138768309 + ... + 1138822428.

It is an arithmetic number, because the mean of its divisors is an integer number (2008835030916).

Almost surely, 2^{61631605343220} is an apocalyptic number.

61631605343220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61631605343220 is an abundant number, since it is smaller than the sum of its proper divisors (131216557624716).

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

61631605343220 is a wasteful number, since it uses less digits than its factorization.

61631605343220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2277590801 (or 2277590799 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 42.

Adding to 61631605343220 its reverse (2234350613616), we get a palindrome (63865955956836).

The spelling of 61631605343220 in words is "sixty-one trillion, six hundred thirty-one billion, six hundred five million, three hundred forty-three thousand, two hundred twenty".