661643062 has 16 divisors (see below), whose sum is σ = 1028790000. Its totient is φ = 318759840.

The previous prime is 661643053. The next prime is 661643069. The reversal of 661643062 is 260346166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661643069) 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, 17512 + ... + 40372.

It is an arithmetic number, because the mean of its divisors is an integer number (64299375).

Almost surely, 2^661643062 is an apocalyptic number.

661643062 is a deficient number, since it is larger than the sum of its proper divisors (367146938).

661643062 is a wasteful number, since it uses less digits than its factorization.

661643062 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23391.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 661643062 is about 25722.4233306273. The cubic root of 661643062 is about 871.3806685458.

The spelling of 661643062 in words is "six hundred sixty-one million, six hundred forty-three thousand, sixty-two".