40665302640 has 160 divisors (see below), whose sum is σ = 140998118400. Its totient is φ = 10772179200.

The previous prime is 40665302597. The next prime is 40665302677. The reversal of 40665302640 is 4620356604.

40665302640 is a `hidden beast` number, since 4 + 0 + 6 + 6 + 5 + 3 + 0 + 2 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 40665302595 and 40665302604.

It is a congruent number.

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, 263821 + ... + 388499.

It is an arithmetic number, because the mean of its divisors is an integer number (881238240).

Almost surely, 2^40665302640 is an apocalyptic number.

40665302640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40665302640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70499059200).

40665302640 is an abundant number, since it is smaller than the sum of its proper divisors (100332815760).

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

40665302640 is a wasteful number, since it uses less digits than its factorization.

40665302640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124852 (or 124840 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The spelling of 40665302640 in words is "forty billion, six hundred sixty-five million, three hundred two thousand, six hundred forty".