661561302 has 8 divisors (see below), whose sum is σ = 1323122616. Its totient is φ = 220520432.

The previous prime is 661561279. The next prime is 661561319. The reversal of 661561302 is 203165166.

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

661561302 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 661561302.

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, 55130103 + ... + 55130114.

It is an arithmetic number, because the mean of its divisors is an integer number (165390327).

Almost surely, 2^661561302 is an apocalyptic number.

661561302 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

661561302 is a wasteful number, since it uses less digits than its factorization.

661561302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110260222.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 661561302 is about 25720.8340066958. The cubic root of 661561302 is about 871.3447745609.

The spelling of 661561302 in words is "six hundred sixty-one million, five hundred sixty-one thousand, three hundred two".