51678399546 has 64 divisors (see below), whose sum is σ = 115471319040. Its totient is φ = 17131731120.

The previous prime is 51678399523. The next prime is 51678399547. The reversal of 51678399546 is 64599387615.

51678399546 is a `hidden beast` number, since 5 + 1 + 6 + 7 + 83 + 9 + 9 + 546 = 666.

It is a super-2 number, since 2×51678399546² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51678399547) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19061131 + ... + 19063841.

It is an arithmetic number, because the mean of its divisors is an integer number (1804239360).

Almost surely, 2^51678399546 is an apocalyptic number.

51678399546 is an abundant number, since it is smaller than the sum of its proper divisors (63792919494).

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

51678399546 is a wasteful number, since it uses less digits than its factorization.

51678399546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4528 (or 4522 counting only the distinct ones).

The product of its digits is 48988800, while the sum is 63.

The spelling of 51678399546 in words is "fifty-one billion, six hundred seventy-eight million, three hundred ninety-nine thousand, five hundred forty-six".