661322386 has 16 divisors (see below), whose sum is σ = 1036068480. Its totient is φ = 316269360.

The previous prime is 661322369. The next prime is 661322407. The reversal of 661322386 is 683223166.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71370 + ... + 80101.

It is an arithmetic number, because the mean of its divisors is an integer number (64754280).

Almost surely, 2^661322386 is an apocalyptic number.

661322386 is a deficient number, since it is larger than the sum of its proper divisors (374746094).

661322386 is a wasteful number, since it uses less digits than its factorization.

661322386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151569.

The product of its digits is 62208, while the sum is 37.

The square root of 661322386 is about 25716.1891811365. The cubic root of 661322386 is about 871.2398695566.

The spelling of 661322386 in words is "six hundred sixty-one million, three hundred twenty-two thousand, three hundred eighty-six".