61666105655 has 16 divisors (see below), whose sum is σ = 92258901504. Its totient is φ = 38441208480.

The previous prime is 61666105619. The next prime is 61666105663. The reversal of 61666105655 is 55650166616.

It is not a de Polignac number, because 61666105655 - 2¹⁰ = 61666104631 is a prime.

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, 80085467 + ... + 80086236.

It is an arithmetic number, because the mean of its divisors is an integer number (5766181344).

Almost surely, 2^61666105655 is an apocalyptic number.

61666105655 is a deficient number, since it is larger than the sum of its proper divisors (30592795849).

61666105655 is a wasteful number, since it uses less digits than its factorization.

61666105655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160171726.

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 61666105655 in words is "sixty-one billion, six hundred sixty-six million, one hundred five thousand, six hundred fifty-five".