51025019904 has 352 divisors, whose sum is σ = 160301388800. Its totient is φ = 16004874240.

The previous prime is 51025019879. The next prime is 51025019911. The reversal of 51025019904 is 40991052015.

51025019904 is a `hidden beast` number, since 510 + 2 + 50 + 1 + 9 + 90 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31711452 + ... + 31713060.

Almost surely, 2^51025019904 is an apocalyptic number.

51025019904 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51025019904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80150694400).

51025019904 is an abundant number, since it is smaller than the sum of its proper divisors (109276368896).

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

51025019904 is a wasteful number, since it uses less digits than its factorization.

51025019904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1706 (or 1682 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The spelling of 51025019904 in words is "fifty-one billion, twenty-five million, nineteen thousand, nine hundred four".