51961796737 has 2 divisors, whose sum is σ = 51961796738. Its totient is φ = 51961796736.

The previous prime is 51961796723. The next prime is 51961796767. The reversal of 51961796737 is 73769716915.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45775030401 + 6186766336 = 213951^2 + 78656^2 .

It is a cyclic number.

It is not a de Polignac number, because 51961796737 - 2¹⁵ = 51961763969 is a prime.

It is not a weakly prime, because it can be changed into another prime (51961796767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25980898368 + 25980898369.

It is an arithmetic number, because the mean of its divisors is an integer number (25980898369).

Almost surely, 2^51961796737 is an apocalyptic number.

It is an amenable number.

51961796737 is a deficient number, since it is larger than the sum of its proper divisors (1).

51961796737 is an equidigital number, since it uses as much as digits as its factorization.

51961796737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15002820, while the sum is 61.

The spelling of 51961796737 in words is "fifty-one billion, nine hundred sixty-one million, seven hundred ninety-six thousand, seven hundred thirty-seven".