661328190 has 48 divisors (see below), whose sum is σ = 1745132688. Its totient is φ = 173720448.

The previous prime is 661328189. The next prime is 661328191. The reversal of 661328190 is 91823166.

661328190 is a `hidden beast` number, since 6 + 613 + 28 + 19 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (661328189) and next prime (661328191).

It is a super-2 number, since 2×661328190² = 874709949777352200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661328191) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48807 + ... + 60866.

It is an arithmetic number, because the mean of its divisors is an integer number (36356931).

Almost surely, 2^661328190 is an apocalyptic number.

661328190 is an abundant number, since it is smaller than the sum of its proper divisors (1083804498).

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

661328190 is a wasteful number, since it uses less digits than its factorization.

661328190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109753 (or 109750 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 661328190 is about 25716.3020280911. The cubic root of 661328190 is about 871.2424183193.

The spelling of 661328190 in words is "six hundred sixty-one million, three hundred twenty-eight thousand, one hundred ninety".