401533878537 has 80 divisors (see below), whose sum is σ = 689844177792. Its totient is φ = 230372398080.

The previous prime is 401533878503. The next prime is 401533878569. The reversal of 401533878537 is 735878335104.

It is a happy number.

401533878537 is a `hidden beast` number, since 4 + 0 + 1 + 5 + 3 + 38 + 78 + 537 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-401533878537 is a prime.

It is a super-2 number, since 2×401533878537² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (401533878037) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1886823 + ... + 2088819.

Almost surely, 2^401533878537 is an apocalyptic number.

It is an amenable number.

401533878537 is a deficient number, since it is larger than the sum of its proper divisors (288310299255).

401533878537 is a wasteful number, since it uses less digits than its factorization.

401533878537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202140 (or 202131 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 54.

The spelling of 401533878537 in words is "four hundred one billion, five hundred thirty-three million, eight hundred seventy-eight thousand, five hundred thirty-seven".