51099277320 has 192 divisors, whose sum is σ = 204397240320. Its totient is φ = 10781379072.

The previous prime is 51099277319. The next prime is 51099277351. The reversal of 51099277320 is 2377299015.

51099277320 is a `hidden beast` number, since 51 + 0 + 9 + 9 + 277 + 320 = 666.

It is a super-2 number, since 2×51099277320² (a number of 22 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 747144 + ... + 812663.

It is an arithmetic number, because the mean of its divisors is an integer number (1064568960).

Almost surely, 2^51099277320 is an apocalyptic number.

It is an amenable number.

51099277320 is an abundant number, since it is smaller than the sum of its proper divisors (153297963000).

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

51099277320 is a wasteful number, since it uses less digits than its factorization.

51099277320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1559844 (or 1559837 counting only the distinct ones).

The product of its (nonzero) digits is 238140, while the sum is 45.

The spelling of 51099277320 in words is "fifty-one billion, ninety-nine million, two hundred seventy-seven thousand, three hundred twenty".