61365123642 has 16 divisors (see below), whose sum is σ = 128066345280. Its totient is φ = 19565691552.

The previous prime is 61365123641. The next prime is 61365123671. The reversal of 61365123642 is 24632156316.

It is a self number, because there is not a number n which added to its sum of digits gives 61365123642.

It is not an unprimeable number, because it can be changed into a prime (61365123641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222337267 + ... + 222337542.

It is an arithmetic number, because the mean of its divisors is an integer number (8004146580).

Almost surely, 2^61365123642 is an apocalyptic number.

61365123642 is an abundant number, since it is smaller than the sum of its proper divisors (66701221638).

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

61365123642 is a wasteful number, since it uses less digits than its factorization.

61365123642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444674837.

The product of its digits is 155520, while the sum is 39.

Adding to 61365123642 its reverse (24632156316), we get a palindrome (85997279958).

The spelling of 61365123642 in words is "sixty-one billion, three hundred sixty-five million, one hundred twenty-three thousand, six hundred forty-two".