661012392 has 16 divisors (see below), whose sum is σ = 1652531040. Its totient is φ = 220337456.

The previous prime is 661012381. The next prime is 661012403. The reversal of 661012392 is 293210166.

It is an interprime number because it is at equal distance from previous prime (661012381) and next prime (661012403).

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 3 ways as a sum of consecutive naturals, for example, 13771068 + ... + 13771115.

It is an arithmetic number, because the mean of its divisors is an integer number (103283190).

Almost surely, 2^661012392 is an apocalyptic number.

It is an amenable number.

661012392 is an abundant number, since it is smaller than the sum of its proper divisors (991518648).

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

661012392 is a wasteful number, since it uses less digits than its factorization.

661012392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27542192 (or 27542188 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 661012392 is about 25710.1612597043. The cubic root of 661012392 is about 871.1037174325.

The spelling of 661012392 in words is "six hundred sixty-one million, twelve thousand, three hundred ninety-two".