54661513878 has 16 divisors (see below), whose sum is σ = 121470030960. Its totient is φ = 18220504608.

The previous prime is 54661513849. The next prime is 54661513889. The reversal of 54661513878 is 87831516645.

It is a happy number.

54661513878 is a `hidden beast` number, since 5 + 4 + 6 + 615 + 13 + 8 + 7 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 1012250257 = 54661513878 / (5 + 4 + 6 + 6 + 1 + 5 + 1 + 3 + 8 + 7 + 8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 506125075 + ... + 506125182.

It is an arithmetic number, because the mean of its divisors is an integer number (7591876935).

Almost surely, 2^54661513878 is an apocalyptic number.

54661513878 is an abundant number, since it is smaller than the sum of its proper divisors (66808517082).

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

54661513878 is a wasteful number, since it uses less digits than its factorization.

54661513878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012250268 (or 1012250262 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 54.

The spelling of 54661513878 in words is "fifty-four billion, six hundred sixty-one million, five hundred thirteen thousand, eight hundred seventy-eight".