51474538368 has 672 divisors, whose sum is σ = 174373022880. Its totient is φ = 15109079040.

The previous prime is 51474538337. The next prime is 51474538373. The reversal of 51474538368 is 86383547415.

51474538368 is a `hidden beast` number, since 5 + 1 + 4 + 74 + 538 + 36 + 8 = 666.

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

Its product of digits (9676800) is a multiple of the sum of its prime divisors (160).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 530665296 + ... + 530665392.

It is an arithmetic number, because the mean of its divisors is an integer number (259483665).

Almost surely, 2^51474538368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51474538368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87186511440).

51474538368 is an abundant number, since it is smaller than the sum of its proper divisors (122898484512).

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

51474538368 is an equidigital number, since it uses as much as digits as its factorization.

51474538368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 160 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 54.

The spelling of 51474538368 in words is "fifty-one billion, four hundred seventy-four million, five hundred thirty-eight thousand, three hundred sixty-eight".