39305661721672 has 32 divisors (see below), whose sum is σ = 73846980537120. Its totient is φ = 19613173507200.

The previous prime is 39305661721657. The next prime is 39305661721693. The reversal of 39305661721672 is 27612716650393.

It is a super-2 number, since 2×39305661721672² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5383743 + ... + 10372849.

It is an arithmetic number, because the mean of its divisors is an integer number (2307718141785).

Almost surely, 2^{39305661721672} is an apocalyptic number.

It is an amenable number.

39305661721672 is a deficient number, since it is larger than the sum of its proper divisors (34541318815448).

39305661721672 is a wasteful number, since it uses less digits than its factorization.

39305661721672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4991101 (or 4991097 counting only the distinct ones).

The product of its (nonzero) digits is 17146080, while the sum is 58.

The spelling of 39305661721672 in words is "thirty-nine trillion, three hundred five billion, six hundred sixty-one million, seven hundred twenty-one thousand, six hundred seventy-two".