61685581319 has 32 divisors (see below), whose sum is σ = 69129676800. Its totient is φ = 54762462720.

The previous prime is 61685581283. The next prime is 61685581339. The reversal of 61685581319 is 91318558616.

It is a cyclic number.

It is not a de Polignac number, because 61685581319 - 2²⁰ = 61684532743 is a prime.

It is a super-2 number, since 2×61685581319² (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 (61685581339) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14618792 + ... + 14623010.

It is an arithmetic number, because the mean of its divisors is an integer number (2160302400).

Almost surely, 2^61685581319 is an apocalyptic number.

61685581319 is a deficient number, since it is larger than the sum of its proper divisors (7444095481).

61685581319 is a wasteful number, since it uses less digits than its factorization.

61685581319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4943.

The product of its digits is 1555200, while the sum is 53.

The spelling of 61685581319 in words is "sixty-one billion, six hundred eighty-five million, five hundred eighty-one thousand, three hundred nineteen".