65980935121 has 2 divisors, whose sum is σ = 65980935122. Its totient is φ = 65980935120.

The previous prime is 65980935073. The next prime is 65980935131. The reversal of 65980935121 is 12153908956.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37031614096 + 28949321025 = 192436^2 + 170145^2 .

It is a cyclic number.

It is not a de Polignac number, because 65980935121 - 2¹⁵ = 65980902353 is a prime.

It is a super-2 number, since 2×65980935121² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65980935131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32990467560 + 32990467561.

It is an arithmetic number, because the mean of its divisors is an integer number (32990467561).

Almost surely, 2^65980935121 is an apocalyptic number.

It is an amenable number.

65980935121 is a deficient number, since it is larger than the sum of its proper divisors (1).

65980935121 is an equidigital number, since it uses as much as digits as its factorization.

65980935121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 583200, while the sum is 49.

The spelling of 65980935121 in words is "sixty-five billion, nine hundred eighty million, nine hundred thirty-five thousand, one hundred twenty-one".