39525697640 has 128 divisors (see below), whose sum is σ = 106452662400. Its totient is φ = 13016939520.

The previous prime is 39525697613. The next prime is 39525697667. The reversal of 39525697640 is 4679652593.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (39525697613) and next prime (39525697667).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 237971 + ... + 368349.

It is an arithmetic number, because the mean of its divisors is an integer number (831661425).

Almost surely, 2^39525697640 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 39525697640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53226331200).

39525697640 is an abundant number, since it is smaller than the sum of its proper divisors (66926964760).

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

39525697640 is a wasteful number, since it uses less digits than its factorization.

39525697640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130467 (or 130463 counting only the distinct ones).

The product of its (nonzero) digits is 12247200, while the sum is 56.

The spelling of 39525697640 in words is "thirty-nine billion, five hundred twenty-five million, six hundred ninety-seven thousand, six hundred forty".