39892685172661 has 2 divisors, whose sum is σ = 39892685172662. Its totient is φ = 39892685172660.

The previous prime is 39892685172649. The next prime is 39892685172667. The reversal of 39892685172661 is 16627158629893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38411559662436 + 1481125510225 = 6197706^2 + 1217015^2 .

It is a cyclic number.

It is not a de Polignac number, because 39892685172661 - 2³⁷ = 39755246219189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39892685172667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19946342586330 + 19946342586331.

It is an arithmetic number, because the mean of its divisors is an integer number (19946342586331).

Almost surely, 2^{39892685172661} is an apocalyptic number.

It is an amenable number.

39892685172661 is a deficient number, since it is larger than the sum of its proper divisors (1).

39892685172661 is an equidigital number, since it uses as much as digits as its factorization.

39892685172661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 470292480, while the sum is 73.

The spelling of 39892685172661 in words is "thirty-nine trillion, eight hundred ninety-two billion, six hundred eighty-five million, one hundred seventy-two thousand, six hundred sixty-one".