61664662666 has 32 divisors (see below), whose sum is σ = 99762425280. Its totient is φ = 28479718656.

The previous prime is 61664662651. The next prime is 61664662757. The reversal of 61664662666 is 66626646616.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1204605 + ... + 1254751.

It is an arithmetic number, because the mean of its divisors is an integer number (3117575790).

Almost surely, 2^61664662666 is an apocalyptic number.

61664662666 is a deficient number, since it is larger than the sum of its proper divisors (38097762614).

61664662666 is a wasteful number, since it uses less digits than its factorization.

61664662666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50838.

The product of its digits is 13436928, while the sum is 55.

The spelling of 61664662666 in words is "sixty-one billion, six hundred sixty-four million, six hundred sixty-two thousand, six hundred sixty-six".