51497915040 has 1152 divisors, whose sum is σ = 223968955392. Its totient is φ = 10581442560.

The previous prime is 51497914991. The next prime is 51497915071. The reversal of 51497915040 is 4051979415.

51497915040 is a `hidden beast` number, since 5 + 1 + 497 + 9 + 150 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 191 ways as a sum of consecutive naturals, for example, 164529924 + ... + 164530236.

It is an arithmetic number, because the mean of its divisors is an integer number (194417496).

Almost surely, 2^51497915040 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 51497915040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111984477696).

51497915040 is an abundant number, since it is smaller than the sum of its proper divisors (172471040352).

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

51497915040 is a wasteful number, since it uses less digits than its factorization.

51497915040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422 (or 411 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The spelling of 51497915040 in words is "fifty-one billion, four hundred ninety-seven million, nine hundred fifteen thousand, forty".