61503110731 has 16 divisors (see below), whose sum is σ = 65968957440. Its totient is φ = 57132017280.

The previous prime is 61503110659. The next prime is 61503110749. The reversal of 61503110731 is 13701130516.

It is a cyclic number.

It is not a de Polignac number, because 61503110731 - 2²⁵ = 61469556299 is a prime.

It is a super-2 number, since 2×61503110731² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61503110731.

It is not an unprimeable number, because it can be changed into a prime (61503110761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4757166 + ... + 4770076.

It is an arithmetic number, because the mean of its divisors is an integer number (4123059840).

Almost surely, 2^61503110731 is an apocalyptic number.

61503110731 is a deficient number, since it is larger than the sum of its proper divisors (4465846709).

61503110731 is a wasteful number, since it uses less digits than its factorization.

61503110731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16554.

The product of its (nonzero) digits is 1890, while the sum is 28.

The spelling of 61503110731 in words is "sixty-one billion, five hundred three million, one hundred ten thousand, seven hundred thirty-one".