65037161521 has 2 divisors, whose sum is σ = 65037161522. Its totient is φ = 65037161520.

The previous prime is 65037161513. The next prime is 65037161573. The reversal of 65037161521 is 12516173056.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61516400625 + 3520760896 = 248025^2 + 59336^2 .

It is a cyclic number.

It is not a de Polignac number, because 65037161521 - 2³ = 65037161513 is a prime.

It is not a weakly prime, because it can be changed into another prime (65037161591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32518580760 + 32518580761.

It is an arithmetic number, because the mean of its divisors is an integer number (32518580761).

Almost surely, 2^65037161521 is an apocalyptic number.

It is an amenable number.

65037161521 is a deficient number, since it is larger than the sum of its proper divisors (1).

65037161521 is an equidigital number, since it uses as much as digits as its factorization.

65037161521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 37.

The spelling of 65037161521 in words is "sixty-five billion, thirty-seven million, one hundred sixty-one thousand, five hundred twenty-one".