39661789929744 has 160 divisors (see below), whose sum is σ = 104214656692224. Its totient is φ = 12996263969280.

The previous prime is 39661789929743. The next prime is 39661789929779. The reversal of 39661789929744 is 44792998716693.

It is a super-2 number, since 2×39661789929744² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (39661789929743) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 553351029 + ... + 553422699.

Almost surely, 2^{39661789929744} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39661789929744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52107328346112).

39661789929744 is an abundant number, since it is smaller than the sum of its proper divisors (64552866762480).

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

39661789929744 is a wasteful number, since it uses less digits than its factorization.

39661789929744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72605 (or 72599 counting only the distinct ones).

The product of its digits is 8888527872, while the sum is 84.

The spelling of 39661789929744 in words is "thirty-nine trillion, six hundred sixty-one billion, seven hundred eighty-nine million, nine hundred twenty-nine thousand, seven hundred forty-four".