51205969375 has 20 divisors (see below), whose sum is σ = 69803986824. Its totient is φ = 37240700000.

The previous prime is 51205969351. The next prime is 51205969387. The reversal of 51205969375 is 57396950215.

It is not a de Polignac number, because 51205969375 - 2¹⁷ = 51205838303 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3717196 + ... + 3730945.

Almost surely, 2^51205969375 is an apocalyptic number.

51205969375 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51205969375 is a deficient number, since it is larger than the sum of its proper divisors (18598017449).

51205969375 is an equidigital number, since it uses as much as digits as its factorization.

51205969375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7448172 (or 7448157 counting only the distinct ones).

The product of its (nonzero) digits is 2551500, while the sum is 52.

The spelling of 51205969375 in words is "fifty-one billion, two hundred five million, nine hundred sixty-nine thousand, three hundred seventy-five".