400623501666 has 8 divisors (see below), whose sum is σ = 801247003344. Its totient is φ = 133541167220.

The previous prime is 400623501643. The next prime is 400623501673. The reversal of 400623501666 is 666105326004.

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

400623501666 is an admirable number.

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, 33385291800 + ... + 33385291811.

It is an arithmetic number, because the mean of its divisors is an integer number (100155875418).

Almost surely, 2^400623501666 is an apocalyptic number.

400623501666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

400623501666 is a wasteful number, since it uses less digits than its factorization.

400623501666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66770583616.

The product of its (nonzero) digits is 155520, while the sum is 39.

The spelling of 400623501666 in words is "four hundred billion, six hundred twenty-three million, five hundred one thousand, six hundred sixty-six".