661042659 has 8 divisors (see below), whose sum is σ = 898020432. Its totient is φ = 432380000.

The previous prime is 661042651. The next prime is 661042663. The reversal of 661042659 is 956240166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661042659 - 2³ = 661042651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661042651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2078592 + ... + 2078909.

It is an arithmetic number, because the mean of its divisors is an integer number (112252554).

Almost surely, 2^661042659 is an apocalyptic number.

661042659 is a deficient number, since it is larger than the sum of its proper divisors (236977773).

661042659 is a wasteful number, since it uses less digits than its factorization.

661042659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4157557.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 661042659 is about 25710.7498723783. The cubic root of 661042659 is about 871.1170128432.

The spelling of 661042659 in words is "six hundred sixty-one million, forty-two thousand, six hundred fifty-nine".