400166655 has 128 divisors (see below), whose sum is σ = 816334848. Its totient is φ = 163233792.

The previous prime is 400166653. The next prime is 400166671. The reversal of 400166655 is 556661004.

It is not a de Polignac number, because 400166655 - 2¹ = 400166653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400166653) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4821244 + ... + 4821326.

It is an arithmetic number, because the mean of its divisors is an integer number (6377616).

Almost surely, 2^400166655 is an apocalyptic number.

400166655 is an abundant number, since it is smaller than the sum of its proper divisors (416168193).

400166655 is a wasteful number, since it uses less digits than its factorization.

400166655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 400166655 is about 20004.1659411234. The cubic root of 400166655 is about 736.9086125652.

The spelling of 400166655 in words is "four hundred million, one hundred sixty-six thousand, six hundred fifty-five".