39161243664 has 225 divisors, whose sum is σ = 118984094383. Its totient is φ = 12433950144.

The previous prime is 39161243659. The next prime is 39161243669. The reversal of 39161243664 is 46634216193.

The square root of 39161243664 is 197892.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (39161243659) and next prime (39161243669).

It is a super-2 number, since 2×39161243664² (a number of 22 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39161243669) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 163854457 + ... + 163854695.

Almost surely, 2^39161243664 is an apocalyptic number.

39161243664 is the 197892-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39161243664

39161243664 is an abundant number, since it is smaller than the sum of its proper divisors (79822850719).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39161243664 is an equidigital number, since it uses as much as digits as its factorization.

39161243664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544 (or 267 counting only the distinct ones).

The product of its digits is 559872, while the sum is 45.

The spelling of 39161243664 in words is "thirty-nine billion, one hundred sixty-one million, two hundred forty-three thousand, six hundred sixty-four".