402155566 has 8 divisors (see below), whose sum is σ = 603328824. Its totient is φ = 201045960.

The previous prime is 402155563. The next prime is 402155581. The reversal of 402155566 is 665551204.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402155563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5821 + ... + 28951.

It is an arithmetic number, because the mean of its divisors is an integer number (75416103).

Almost surely, 2^402155566 is an apocalyptic number.

402155566 is a deficient number, since it is larger than the sum of its proper divisors (201173258).

402155566 is a wasteful number, since it uses less digits than its factorization.

402155566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31826.

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 402155566 is about 20053.8167439518. The cubic root of 402155566 is about 738.1274581991.

The spelling of 402155566 in words is "four hundred two million, one hundred fifty-five thousand, five hundred sixty-six".