61364021521631 has 8 divisors (see below), whose sum is σ = 61371172237824. Its totient is φ = 61356871124640.

The previous prime is 61364021521591. The next prime is 61364021521687. The reversal of 61364021521631 is 13612512046316.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61364021521631 - 2¹⁴ = 61364021505247 is a prime.

It is a super-2 number, since 2×61364021521631² (a number of 28 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 (61364021526631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 785098805 + ... + 785176961.

It is an arithmetic number, because the mean of its divisors is an integer number (7671396529728).

Almost surely, 2^{61364021521631} is an apocalyptic number.

61364021521631 is a deficient number, since it is larger than the sum of its proper divisors (7150716193).

61364021521631 is a wasteful number, since it uses less digits than its factorization.

61364021521631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159601.

The product of its (nonzero) digits is 155520, while the sum is 41.

Adding to 61364021521631 its reverse (13612512046316), we get a palindrome (74976533567947).

The spelling of 61364021521631 in words is "sixty-one trillion, three hundred sixty-four billion, twenty-one million, five hundred twenty-one thousand, six hundred thirty-one".