661817102 has 8 divisors (see below), whose sum is σ = 993297216. Its totient is φ = 330718032.

The previous prime is 661817081. The next prime is 661817119. The reversal of 661817102 is 201718166.

It is a happy number.

661817102 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90878 + ... + 97889.

It is an arithmetic number, because the mean of its divisors is an integer number (124162152).

Almost surely, 2^661817102 is an apocalyptic number.

661817102 is a deficient number, since it is larger than the sum of its proper divisors (331480114).

661817102 is a wasteful number, since it uses less digits than its factorization.

661817102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190522.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 661817102 is about 25725.8061486905. The cubic root of 661817102 is about 871.4570651233.

The spelling of 661817102 in words is "six hundred sixty-one million, eight hundred seventeen thousand, one hundred two".