401817684879 has 40 divisors (see below), whose sum is σ = 646533462960. Its totient is φ = 247228619904.

The previous prime is 401817684871. The next prime is 401817684881. The reversal of 401817684879 is 978486718104.

401817684879 is a `hidden beast` number, since 4 + 0 + 1 + 81 + 76 + 8 + 487 + 9 = 666.

It is not a de Polignac number, because 401817684879 - 2³ = 401817684871 is a prime.

It is a super-2 number, since 2×401817684879² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401817684871) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6515812 + ... + 6577190.

It is an arithmetic number, because the mean of its divisors is an integer number (16163336574).

Almost surely, 2^401817684879 is an apocalyptic number.

401817684879 is a deficient number, since it is larger than the sum of its proper divisors (244715778081).

401817684879 is a wasteful number, since it uses less digits than its factorization.

401817684879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67621 (or 67612 counting only the distinct ones).

The product of its (nonzero) digits is 21676032, while the sum is 63.

The spelling of 401817684879 in words is "four hundred one billion, eight hundred seventeen million, six hundred eighty-four thousand, eight hundred seventy-nine".