401650186878 has 24 divisors (see below), whose sum is σ = 870402342888. Its totient is φ = 133858738512.

The previous prime is 401650186859. The next prime is 401650186901. The reversal of 401650186878 is 878681056104.

It is a happy number.

401650186878 is a `hidden beast` number, since 4 + 0 + 1 + 6 + 501 + 8 + 68 + 78 = 666.

It is a super-2 number, since 2×401650186878² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1954176 + ... + 2149907.

It is an arithmetic number, because the mean of its divisors is an integer number (36266764287).

Almost surely, 2^401650186878 is an apocalyptic number.

401650186878 is an abundant number, since it is smaller than the sum of its proper divisors (468752156010).

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

401650186878 is a wasteful number, since it uses less digits than its factorization.

401650186878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4109528 (or 4109525 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 54.

The spelling of 401650186878 in words is "four hundred one billion, six hundred fifty million, one hundred eighty-six thousand, eight hundred seventy-eight".