661010104 has 24 divisors (see below), whose sum is σ = 1268915760. Its totient is φ = 322811664.

The previous prime is 661010101. The next prime is 661010113. The reversal of 661010104 is 401010166.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661010101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7552 + ... + 37135.

It is an arithmetic number, because the mean of its divisors is an integer number (52871490).

Almost surely, 2^661010104 is an apocalyptic number.

It is an amenable number.

661010104 is a deficient number, since it is larger than the sum of its proper divisors (607905656).

661010104 is a wasteful number, since it uses less digits than its factorization.

661010104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44779 (or 44732 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 661010104 is about 25710.1167636400. The cubic root of 661010104 is about 871.1027123643.

The spelling of 661010104 in words is "six hundred sixty-one million, ten thousand, one hundred four".