661660262 has 8 divisors (see below), whose sum is σ = 992748936. Its totient is φ = 330743952.

The previous prime is 661660261. The next prime is 661660271. The reversal of 661660262 is 262066166.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661660261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33023 + ... + 49130.

It is an arithmetic number, because the mean of its divisors is an integer number (124093617).

Almost surely, 2^661660262 is an apocalyptic number.

661660262 is a deficient number, since it is larger than the sum of its proper divisors (331088674).

661660262 is a wasteful number, since it uses less digits than its factorization.

661660262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86182.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 661660262 is about 25722.7576670932. The cubic root of 661660262 is about 871.3882192523.

The spelling of 661660262 in words is "six hundred sixty-one million, six hundred sixty thousand, two hundred sixty-two".