661002646 has 8 divisors (see below), whose sum is σ = 1023488064. Its totient is φ = 319839960.

The previous prime is 661002631. The next prime is 661002659. The reversal of 661002646 is 646200166.

661002646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Harshad number since it is a multiple of its sum of digits (31).

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, 5330605 + ... + 5330728.

It is an arithmetic number, because the mean of its divisors is an integer number (127936008).

Almost surely, 2^661002646 is an apocalyptic number.

661002646 is a deficient number, since it is larger than the sum of its proper divisors (362485418).

661002646 is a wasteful number, since it uses less digits than its factorization.

661002646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10661366.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 661002646 is about 25709.9717230494. The cubic root of 661002646 is about 871.0994362124.

The spelling of 661002646 in words is "six hundred sixty-one million, two thousand, six hundred forty-six".