61140561615 has 64 divisors (see below), whose sum is σ = 125200465920. Its totient is φ = 27729838080.

The previous prime is 61140561571. The next prime is 61140561617. The reversal of 61140561615 is 51616504116.

It is not a de Polignac number, because 61140561615 - 2¹⁸ = 61140299471 is a prime.

It is a super-2 number, since 2×61140561615² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61140561615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61140561617) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 134706 + ... + 374735.

It is an arithmetic number, because the mean of its divisors is an integer number (1956257280).

Almost surely, 2^61140561615 is an apocalyptic number.

61140561615 is an abundant number, since it is smaller than the sum of its proper divisors (64059904305).

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

61140561615 is a wasteful number, since it uses less digits than its factorization.

61140561615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509589 (or 509583 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The spelling of 61140561615 in words is "sixty-one billion, one hundred forty million, five hundred sixty-one thousand, six hundred fifteen".