51986430990 has 96 divisors (see below), whose sum is σ = 150953283936. Its totient is φ = 12796652160.

The previous prime is 51986430959. The next prime is 51986431009. The reversal of 51986430990 is 9903468915.

51986430990 is a `hidden beast` number, since 5 + 198 + 64 + 309 + 90 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 791241 + ... + 854420.

It is an arithmetic number, because the mean of its divisors is an integer number (1572430041).

Almost surely, 2^51986430990 is an apocalyptic number.

51986430990 is an abundant number, since it is smaller than the sum of its proper divisors (98966852946).

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

51986430990 is a wasteful number, since it uses less digits than its factorization.

51986430990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1645696 (or 1645684 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The spelling of 51986430990 in words is "fifty-one billion, nine hundred eighty-six million, four hundred thirty thousand, nine hundred ninety".