51494697378432 has 3840 divisors, whose sum is σ = 209673178767360. Its totient is φ = 12254776934400.

The previous prime is 51494697378409. The next prime is 51494697378457. The reversal of 51494697378432 is 23487379649415.

51494697378432 is a `hidden beast` number, since 5 + 1 + 494 + 6 + 97 + 3 + 7 + 8 + 43 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 479 ways as a sum of consecutive naturals, for example, 620418040663 + ... + 620418040745.

It is an arithmetic number, because the mean of its divisors is an integer number (54602390304).

Almost surely, 2^{51494697378432} 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 51494697378432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104836589383680).

51494697378432 is an abundant number, since it is smaller than the sum of its proper divisors (158178481388928).

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

51494697378432 is a wasteful number, since it uses less digits than its factorization.

51494697378432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265 (or 233 counting only the distinct ones).

The product of its digits is 1097349120, while the sum is 72.

The spelling of 51494697378432 in words is "fifty-one trillion, four hundred ninety-four billion, six hundred ninety-seven million, three hundred seventy-eight thousand, four hundred thirty-two".