661012412 has 12 divisors (see below), whose sum is σ = 1159351200. Its totient is φ = 329769216.

The previous prime is 661012403. The next prime is 661012427. The reversal of 661012412 is 214210166.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182228 + ... + 185819.

It is an arithmetic number, because the mean of its divisors is an integer number (96612600).

Almost surely, 2^661012412 is an apocalyptic number.

It is an amenable number.

661012412 is a deficient number, since it is larger than the sum of its proper divisors (498338788).

661012412 is a wasteful number, since it uses less digits than its factorization.

661012412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368500 (or 368498 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 661012412 is about 25710.1616486556. The cubic root of 661012412 is about 871.1037262180.

Adding to 661012412 its reverse (214210166), we get a palindrome (875222578).

The spelling of 661012412 in words is "six hundred sixty-one million, twelve thousand, four hundred twelve".