625666405 has 16 divisors (see below), whose sum is σ = 924061824. Its totient is φ = 396025920.

The previous prime is 625666399. The next prime is 625666463. The reversal of 625666405 is 504666526.

625666405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 625666405 - 2⁵ = 625666373 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 687091 + ... + 688000.

It is an arithmetic number, because the mean of its divisors is an integer number (57753864).

Almost surely, 2^625666405 is an apocalyptic number.

625666405 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

625666405 is a deficient number, since it is larger than the sum of its proper divisors (298395419).

625666405 is a wasteful number, since it uses less digits than its factorization.

625666405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375116.

The product of its (nonzero) digits is 259200, while the sum is 40.

The square root of 625666405 is about 25013.3245491278. The cubic root of 625666405 is about 855.2917418053.

The spelling of 625666405 in words is "six hundred twenty-five million, six hundred sixty-six thousand, four hundred five".