61231349565 has 12 divisors (see below), whose sum is σ = 106134339324. Its totient is φ = 32656719744.

The previous prime is 61231349561. The next prime is 61231349587. The reversal of 61231349565 is 56594313216.

61231349565 is a `hidden beast` number, since 6 + 12 + 31 + 3 + 49 + 565 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11317980996 + 49913368569 = 106386^2 + 223413^2 .

It is not a de Polignac number, because 61231349565 - 2² = 61231349561 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1360696657 = 61231349565 / (6 + 1 + 2 + 3 + 1 + 3 + 4 + 9 + 5 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 61231349565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61231349561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 680348284 + ... + 680348373.

It is an arithmetic number, because the mean of its divisors is an integer number (8844528277).

Almost surely, 2^61231349565 is an apocalyptic number.

It is an amenable number.

61231349565 is a deficient number, since it is larger than the sum of its proper divisors (44902989759).

61231349565 is a wasteful number, since it uses less digits than its factorization.

61231349565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360696668 (or 1360696665 counting only the distinct ones).

The product of its digits is 583200, while the sum is 45.

The spelling of 61231349565 in words is "sixty-one billion, two hundred thirty-one million, three hundred forty-nine thousand, five hundred sixty-five".