65409723971 has 2 divisors, whose sum is σ = 65409723972. Its totient is φ = 65409723970.

The previous prime is 65409723959. The next prime is 65409723997. The reversal of 65409723971 is 17932790456.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65409723971 - 2³⁴ = 48229854787 is a prime.

It is not a weakly prime, because it can be changed into another prime (65409723671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32704861985 + 32704861986.

It is an arithmetic number, because the mean of its divisors is an integer number (32704861986).

Almost surely, 2^65409723971 is an apocalyptic number.

65409723971 is a deficient number, since it is larger than the sum of its proper divisors (1).

65409723971 is an equidigital number, since it uses as much as digits as its factorization.

65409723971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2857680, while the sum is 53.

The spelling of 65409723971 in words is "sixty-five billion, four hundred nine million, seven hundred twenty-three thousand, nine hundred seventy-one".