40251865660 has 24 divisors (see below), whose sum is σ = 85686851376. Its totient is φ = 15880187520.

The previous prime is 40251865609. The next prime is 40251865669. The reversal of 40251865660 is 6656815204.

It is a super-2 number, since 2×40251865660² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40251865669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13783426 + ... + 13786345.

It is an arithmetic number, because the mean of its divisors is an integer number (3570285474).

Almost surely, 2^40251865660 is an apocalyptic number.

It is an amenable number.

40251865660 is an abundant number, since it is smaller than the sum of its proper divisors (45434985716).

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

40251865660 is a wasteful number, since it uses less digits than its factorization.

40251865660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27569853 (or 27569851 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 40251865660 in words is "forty billion, two hundred fifty-one million, eight hundred sixty-five thousand, six hundred sixty".