51975708335921 has 2 divisors, whose sum is σ = 51975708335922. Its totient is φ = 51975708335920.

The previous prime is 51975708335791. The next prime is 51975708336001. The reversal of 51975708335921 is 12953380757915.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46771100323600 + 5204608012321 = 6838940^2 + 2281361^2 .

It is a cyclic number.

It is not a de Polignac number, because 51975708335921 - 2³⁸ = 51700830428977 is a prime.

It is not a weakly prime, because it can be changed into another prime (51975708338921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25987854167960 + 25987854167961.

It is an arithmetic number, because the mean of its divisors is an integer number (25987854167961).

Almost surely, 2^{51975708335921} is an apocalyptic number.

It is an amenable number.

51975708335921 is a deficient number, since it is larger than the sum of its proper divisors (1).

51975708335921 is an equidigital number, since it uses as much as digits as its factorization.

51975708335921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 71442000, while the sum is 65.

The spelling of 51975708335921 in words is "fifty-one trillion, nine hundred seventy-five billion, seven hundred eight million, three hundred thirty-five thousand, nine hundred twenty-one".