61879475045 has 18 divisors (see below), whose sum is σ = 75718923378. Its totient is φ = 48546410848.

The previous prime is 61879475027. The next prime is 61879475051. The reversal of 61879475045 is 54057497816.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 16935899044 + 44943576001 = 130138^2 + 211999^2 .

It is not a de Polignac number, because 61879475045 - 2²⁰ = 61878426469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 29479406 + ... + 29481504.

Almost surely, 2^61879475045 is an apocalyptic number.

It is an amenable number.

61879475045 is a deficient number, since it is larger than the sum of its proper divisors (13839448333).

61879475045 is an frugal number, since it uses more digits than its factorization.

61879475045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4309 (or 2157 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 56.

The spelling of 61879475045 in words is "sixty-one billion, eight hundred seventy-nine million, four hundred seventy-five thousand, forty-five".