40625578666 has 8 divisors (see below), whose sum is σ = 60947433540. Its totient is φ = 20309767488.

The previous prime is 40625578633. The next prime is 40625578711. The reversal of 40625578666 is 66687552604.

40625578666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 40392558441 + 233020225 = 200979^2 + 15265^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1494081 + ... + 1521028.

Almost surely, 2^40625578666 is an apocalyptic number.

40625578666 is a deficient number, since it is larger than the sum of its proper divisors (20321854874).

40625578666 is a wasteful number, since it uses less digits than its factorization.

40625578666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3021848.

The product of its (nonzero) digits is 14515200, while the sum is 55.

The spelling of 40625578666 in words is "forty billion, six hundred twenty-five million, five hundred seventy-eight thousand, six hundred sixty-six".