661142744 has 16 divisors (see below), whose sum is σ = 1239932400. Its totient is φ = 330494112.

The previous prime is 661142737. The next prime is 661142761. The reversal of 661142744 is 447241166.

661142744 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 44717 + ... + 57635.

It is an arithmetic number, because the mean of its divisors is an integer number (77495775).

Almost surely, 2^661142744 is an apocalyptic number.

It is an amenable number.

661142744 is a deficient number, since it is larger than the sum of its proper divisors (578789656).

661142744 is a wasteful number, since it uses less digits than its factorization.

661142744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19322 (or 19318 counting only the distinct ones).

The product of its digits is 32256, while the sum is 35.

The square root of 661142744 is about 25712.6961635687. The cubic root of 661142744 is about 871.1609743765.

The spelling of 661142744 in words is "six hundred sixty-one million, one hundred forty-two thousand, seven hundred forty-four".