39702640613 has 2 divisors, whose sum is σ = 39702640614. Its totient is φ = 39702640612.

The previous prime is 39702640553. The next prime is 39702640657. The reversal of 39702640613 is 31604620793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24291404449 + 15411236164 = 155857^2 + 124142^2 .

It is an emirp because it is prime and its reverse (31604620793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39702640613 - 2³⁴ = 22522771429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39702610613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19851320306 + 19851320307.

It is an arithmetic number, because the mean of its divisors is an integer number (19851320307).

Almost surely, 2^39702640613 is an apocalyptic number.

It is an amenable number.

39702640613 is a deficient number, since it is larger than the sum of its proper divisors (1).

39702640613 is an equidigital number, since it uses as much as digits as its factorization.

39702640613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 41.

The spelling of 39702640613 in words is "thirty-nine billion, seven hundred two million, six hundred forty thousand, six hundred thirteen".