401664727776 has 96 divisors (see below), whose sum is σ = 1202268015648. Its totient is φ = 116319191040.

The previous prime is 401664727703. The next prime is 401664727811. The reversal of 401664727776 is 677727466104.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×401664727776² (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 15 ways as a sum of consecutive naturals, for example, 9444865 + ... + 9487296.

It is an arithmetic number, because the mean of its divisors is an integer number (12523625163).

Almost surely, 2^401664727776 is an apocalyptic number.

It is an amenable number.

401664727776 is an abundant number, since it is smaller than the sum of its proper divisors (800603287872).

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

401664727776 is a wasteful number, since it uses less digits than its factorization.

401664727776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18932204 (or 18932196 counting only the distinct ones).

The product of its (nonzero) digits is 16595712, while the sum is 57.

The spelling of 401664727776 in words is "four hundred one billion, six hundred sixty-four million, seven hundred twenty-seven thousand, seven hundred seventy-six".