61610253785 has 8 divisors (see below), whose sum is σ = 74307596616. Its totient is φ = 49038008320.

The previous prime is 61610253773. The next prime is 61610253799. The reversal of 61610253785 is 58735201616.

It can be written as a sum of positive squares in 4 ways, for example, as 19481459776 + 42128794009 = 139576^2 + 205253^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61610253785 - 2⁴ = 61610253769 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 31273256 + ... + 31275225.

It is an arithmetic number, because the mean of its divisors is an integer number (9288449577).

Almost surely, 2^61610253785 is an apocalyptic number.

It is an amenable number.

61610253785 is a deficient number, since it is larger than the sum of its proper divisors (12697342831).

61610253785 is a wasteful number, since it uses less digits than its factorization.

61610253785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62548683.

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 61610253785 in words is "sixty-one billion, six hundred ten million, two hundred fifty-three thousand, seven hundred eighty-five".