61479977493 has 16 divisors (see below), whose sum is σ = 89453339712. Its totient is φ = 37248960000.

The previous prime is 61479977483. The next prime is 61479977501. The reversal of 61479977493 is 39477997416.

It is not a de Polignac number, because 61479977493 - 2¹³ = 61479969301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61479977443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182908 + ... + 395493.

It is an arithmetic number, because the mean of its divisors is an integer number (5590833732).

Almost surely, 2^61479977493 is an apocalyptic number.

It is an amenable number.

61479977493 is a deficient number, since it is larger than the sum of its proper divisors (27973362219).

61479977493 is a wasteful number, since it uses less digits than its factorization.

61479977493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581636.

The product of its digits is 72013536, while the sum is 66.

The spelling of 61479977493 in words is "sixty-one billion, four hundred seventy-nine million, nine hundred seventy-seven thousand, four hundred ninety-three".