51970821775 has 6 divisors (see below), whose sum is σ = 64443819032. Its totient is φ = 41576657400.

The previous prime is 51970821761. The next prime is 51970821803. The reversal of 51970821775 is 57712807915.

It is not a de Polignac number, because 51970821775 - 2⁷ = 51970821647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1039416411 + ... + 1039416460.

Almost surely, 2^51970821775 is an apocalyptic number.

51970821775 is a deficient number, since it is larger than the sum of its proper divisors (12472997257).

51970821775 is a wasteful number, since it uses less digits than its factorization.

51970821775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2078832881 (or 2078832876 counting only the distinct ones).

The product of its (nonzero) digits is 1234800, while the sum is 52.

The spelling of 51970821775 in words is "fifty-one billion, nine hundred seventy million, eight hundred twenty-one thousand, seven hundred seventy-five".