61666333615 has 16 divisors (see below), whose sum is σ = 74514529152. Its totient is φ = 48990150144.

The previous prime is 61666333571. The next prime is 61666333627. The reversal of 61666333615 is 51633366616.

It is a cyclic number.

It is not a de Polignac number, because 61666333615 - 2²³ = 61657945007 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 1372842 + ... + 1417048.

It is an arithmetic number, because the mean of its divisors is an integer number (4657158072).

Almost surely, 2^61666333615 is an apocalyptic number.

61666333615 is a deficient number, since it is larger than the sum of its proper divisors (12848195537).

61666333615 is a wasteful number, since it uses less digits than its factorization.

61666333615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46146.

The product of its digits is 1049760, while the sum is 46.

The spelling of 61666333615 in words is "sixty-one billion, six hundred sixty-six million, three hundred thirty-three thousand, six hundred fifteen".