401533878538 has 16 divisors (see below), whose sum is σ = 686786453640. Its totient is φ = 174421956096.

The previous prime is 401533878503. The next prime is 401533878569. The reversal of 401533878538 is 835878335104.

It can be written as a sum of positive squares in 4 ways, for example, as 343615198969 + 57918679569 = 586187^2 + 240663^2 .

It is a super-2 number, since 2×401533878538² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 454223403 + ... + 454224286.

Almost surely, 2^401533878538 is an apocalyptic number.

401533878538 is a deficient number, since it is larger than the sum of its proper divisors (285252575102).

401533878538 is a wasteful number, since it uses less digits than its factorization.

401533878538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908447721.

The product of its (nonzero) digits is 9676800, while the sum is 55.

The spelling of 401533878538 in words is "four hundred one billion, five hundred thirty-three million, eight hundred seventy-eight thousand, five hundred thirty-eight".