61564421352 has 64 divisors (see below), whose sum is σ = 175949884800. Its totient is φ = 17584680960.

The previous prime is 61564421351. The next prime is 61564421353. The reversal of 61564421352 is 25312446516.

It is an interprime number because it is at equal distance from previous prime (61564421351) and next prime (61564421353).

It is a self number, because there is not a number n which added to its sum of digits gives 61564421352.

It is not an unprimeable number, because it can be changed into a prime (61564421351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 540952 + ... + 644792.

It is an arithmetic number, because the mean of its divisors is an integer number (2749216950).

Almost surely, 2^61564421352 is an apocalyptic number.

It is an amenable number.

61564421352 is an abundant number, since it is smaller than the sum of its proper divisors (114385463448).

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

61564421352 is a wasteful number, since it uses less digits than its factorization.

61564421352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107386 (or 107382 counting only the distinct ones).

The product of its digits is 172800, while the sum is 39.

Adding to 61564421352 its reverse (25312446516), we get a palindrome (86876867868).

The spelling of 61564421352 in words is "sixty-one billion, five hundred sixty-four million, four hundred twenty-one thousand, three hundred fifty-two".