401366166565 has 32 divisors (see below), whose sum is σ = 593041962240. Its totient is φ = 253942262784.

The previous prime is 401366166433. The next prime is 401366166587. The reversal of 401366166565 is 565661663104.

It is not a de Polignac number, because 401366166565 - 2¹¹ = 401366164517 is a prime.

It is a super-2 number, since 2×401366166565² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 875677 + ... + 1252813.

It is an arithmetic number, because the mean of its divisors is an integer number (18532561320).

Almost surely, 2^401366166565 is an apocalyptic number.

It is an amenable number.

401366166565 is a deficient number, since it is larger than the sum of its proper divisors (191675795675).

401366166565 is a wasteful number, since it uses less digits than its factorization.

401366166565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379501.

The product of its (nonzero) digits is 2332800, while the sum is 49.

The spelling of 401366166565 in words is "four hundred one billion, three hundred sixty-six million, one hundred sixty-six thousand, five hundred sixty-five".