51216995775 has 96 divisors (see below), whose sum is σ = 94688225280. Its totient is φ = 24213168000.

The previous prime is 51216995761. The next prime is 51216995801. The reversal of 51216995775 is 57759961215.

It is not a de Polignac number, because 51216995775 - 2¹³ = 51216987583 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 32600740 + ... + 32602310.

It is an arithmetic number, because the mean of its divisors is an integer number (986335680).

Almost surely, 2^51216995775 is an apocalyptic number.

51216995775 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51216995775 is a deficient number, since it is larger than the sum of its proper divisors (43471229505).

51216995775 is a wasteful number, since it uses less digits than its factorization.

51216995775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2557 (or 2552 counting only the distinct ones).

The product of its digits is 5953500, while the sum is 57.

The spelling of 51216995775 in words is "fifty-one billion, two hundred sixteen million, nine hundred ninety-five thousand, seven hundred seventy-five".