401366555 has 4 divisors (see below), whose sum is σ = 481639872. Its totient is φ = 321093240.

The previous prime is 401366527. The next prime is 401366573. The reversal of 401366555 is 555663104.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 401366555 - 2⁸ = 401366299 is a prime.

It is a super-2 number, since 2×401366555² = 322190222945136050, which contains 22 as substring.

It is a Duffinian 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, 40136651 + ... + 40136660.

It is an arithmetic number, because the mean of its divisors is an integer number (120409968).

Almost surely, 2^401366555 is an apocalyptic number.

401366555 is a deficient number, since it is larger than the sum of its proper divisors (80273317).

401366555 is an equidigital number, since it uses as much as digits as its factorization.

401366555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80273316.

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 401366555 is about 20034.1347454788. The cubic root of 401366555 is about 737.6444179500.

The spelling of 401366555 in words is "four hundred one million, three hundred sixty-six thousand, five hundred fifty-five".