39639395161969 has 2 divisors, whose sum is σ = 39639395161970. Its totient is φ = 39639395161968.

The previous prime is 39639395161871. The next prime is 39639395161981. The reversal of 39639395161969 is 96916159393693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37047977757025 + 2591417404944 = 6086705^2 + 1609788^2 .

It is a cyclic number.

It is not a de Polignac number, because 39639395161969 - 2³⁵ = 39605035423601 is a prime.

It is a super-2 number, since 2×39639395161969² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39639395161999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19819697580984 + 19819697580985.

It is an arithmetic number, because the mean of its divisors is an integer number (19819697580985).

Almost surely, 2^{39639395161969} is an apocalyptic number.

It is an amenable number.

39639395161969 is a deficient number, since it is larger than the sum of its proper divisors (1).

39639395161969 is an equidigital number, since it uses as much as digits as its factorization.

39639395161969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1721868840, while the sum is 79.

The spelling of 39639395161969 in words is "thirty-nine trillion, six hundred thirty-nine billion, three hundred ninety-five million, one hundred sixty-one thousand, nine hundred sixty-nine".