39613654081 has 4 divisors (see below), whose sum is σ = 39786639700. Its totient is φ = 39440668464.

The previous prime is 39613654033. The next prime is 39613654109. The reversal of 39613654081 is 18045631693.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18045631693 = 8167 ⋅2209579.

It can be written as a sum of positive squares in 2 ways, for example, as 16075957681 + 23537696400 = 126791^2 + 153420^2 .

It is a cyclic number.

It is not a de Polignac number, because 39613654081 - 2³⁵ = 5253915713 is a prime.

It is a super-2 number, since 2×39613654081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39613654481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86492466 + ... + 86492923.

It is an arithmetic number, because the mean of its divisors is an integer number (9946659925).

Almost surely, 2^39613654081 is an apocalyptic number.

It is an amenable number.

39613654081 is a deficient number, since it is larger than the sum of its proper divisors (172985619).

39613654081 is a wasteful number, since it uses less digits than its factorization.

39613654081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172985618.

The product of its (nonzero) digits is 466560, while the sum is 46.

The spelling of 39613654081 in words is "thirty-nine billion, six hundred thirteen million, six hundred fifty-four thousand, eighty-one".