39661625772 has 144 divisors (see below), whose sum is σ = 109592028000. Its totient is φ = 12046261248.

The previous prime is 39661625749. The next prime is 39661625797. The reversal of 39661625772 is 27752616693.

39661625772 is a `hidden beast` number, since 3 + 9 + 6 + 6 + 1 + 62 + 577 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5332168 + ... + 5339600.

It is an arithmetic number, because the mean of its divisors is an integer number (761055750).

Almost surely, 2^39661625772 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 39661625772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54796014000).

39661625772 is an abundant number, since it is smaller than the sum of its proper divisors (69930402228).

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

39661625772 is a wasteful number, since it uses less digits than its factorization.

39661625772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7760 (or 7755 counting only the distinct ones).

The product of its digits is 5715360, while the sum is 54.

The spelling of 39661625772 in words is "thirty-nine billion, six hundred sixty-one million, six hundred twenty-five thousand, seven hundred seventy-two".