666626040 has 96 divisors (see below), whose sum is σ = 2225134080. Its totient is φ = 172958976.

The previous prime is 666626021. The next prime is 666626041. The reversal of 666626040 is 40626666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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 = 666625986 and 666626004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666626041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11704 + ... + 38343.

It is an arithmetic number, because the mean of its divisors is an integer number (23178480).

Almost surely, 2^666626040 is an apocalyptic number.

666626040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666626040 is an abundant number, since it is smaller than the sum of its proper divisors (1558508040).

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

666626040 is a wasteful number, since it uses less digits than its factorization.

666626040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50101 (or 50094 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 666626040 is about 25819.1022307128. The cubic root of 666626040 is about 873.5627190446.

The spelling of 666626040 in words is "six hundred sixty-six million, six hundred twenty-six thousand, forty".