61569342831 has 4 divisors (see below), whose sum is σ = 82092457112. Its totient is φ = 41046228552.

The previous prime is 61569342817. The next prime is 61569342847. The reversal of 61569342831 is 13824396516.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61569342831 - 2¹⁹ = 61568818543 is a prime.

It is a super-2 number, since 2×61569342831² (a number of 22 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 (61569346831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10261557136 + ... + 10261557141.

It is an arithmetic number, because the mean of its divisors is an integer number (20523114278).

Almost surely, 2^61569342831 is an apocalyptic number.

61569342831 is a deficient number, since it is larger than the sum of its proper divisors (20523114281).

61569342831 is a wasteful number, since it uses less digits than its factorization.

61569342831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20523114280.

The product of its digits is 933120, while the sum is 48.

The spelling of 61569342831 in words is "sixty-one billion, five hundred sixty-nine million, three hundred forty-two thousand, eight hundred thirty-one".