51149499840 has 224 divisors, whose sum is σ = 182918160960. Its totient is φ = 13452853248.

The previous prime is 51149499757. The next prime is 51149499847. The reversal of 51149499840 is 4899494115.

51149499840 is a `hidden beast` number, since 5 + 1 + 149 + 499 + 8 + 4 + 0 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51149499847) 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, 590172 + ... + 671268.

Almost surely, 2^51149499840 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 51149499840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91459080480).

51149499840 is an abundant number, since it is smaller than the sum of its proper divisors (131768661120).

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

51149499840 is a wasteful number, since it uses less digits than its factorization.

51149499840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81196 (or 81180 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The spelling of 51149499840 in words is "fifty-one billion, one hundred forty-nine million, four hundred ninety-nine thousand, eight hundred forty".