100401066578 has 24 divisors (see below), whose sum is σ = 159864135948. Its totient is φ = 47283437088.

The previous prime is 100401066569. The next prime is 100401066643. The reversal of 100401066578 is 875660104001.

It can be written as a sum of positive squares in 2 ways, for example, as 95996487889 + 4404578689 = 309833^2 + 66367^2 .

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 277001 + ... + 526812.

Almost surely, 2^100401066578 is an apocalyptic number.

100401066578 is a deficient number, since it is larger than the sum of its proper divisors (59463069370).

100401066578 is a wasteful number, since it uses less digits than its factorization.

100401066578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804026 (or 804007 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 38.

The spelling of 100401066578 in words is "one hundred billion, four hundred one million, sixty-six thousand, five hundred seventy-eight".