61744661478 has 32 divisors (see below), whose sum is σ = 137814837120. Its totient is φ = 20490882120.

The previous prime is 61744661467. The next prime is 61744661483. The reversal of 61744661478 is 87416644716.

It is a happy number.

61744661478 is a `hidden beast` number, since 6 + 1 + 74 + 46 + 61 + 478 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2506288 + ... + 2530803.

It is an arithmetic number, because the mean of its divisors is an integer number (4306713660).

Almost surely, 2^61744661478 is an apocalyptic number.

61744661478 is an abundant number, since it is smaller than the sum of its proper divisors (76070175642).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61744661478 is a wasteful number, since it uses less digits than its factorization.

61744661478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5037329 (or 5037323 counting only the distinct ones).

The product of its digits is 5419008, while the sum is 54.

The spelling of 61744661478 in words is "sixty-one billion, seven hundred forty-four million, six hundred sixty-one thousand, four hundred seventy-eight".