661101404 has 6 divisors (see below), whose sum is σ = 1156927464. Its totient is φ = 330550700.

The previous prime is 661101401. The next prime is 661101439. The reversal of 661101404 is 404101166.

It is a self number, because there is not a number n which added to its sum of digits gives 661101404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661101401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82637672 + ... + 82637679.

It is an arithmetic number, because the mean of its divisors is an integer number (192821244).

Almost surely, 2^661101404 is an apocalyptic number.

It is an amenable number.

661101404 is a deficient number, since it is larger than the sum of its proper divisors (495826060).

661101404 is a wasteful number, since it uses less digits than its factorization.

661101404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165275355 (or 165275353 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 661101404 is about 25711.8922679759. The cubic root of 661101404 is about 871.1428166510.

The spelling of 661101404 in words is "six hundred sixty-one million, one hundred one thousand, four hundred four".