61771499966 has 32 divisors (see below), whose sum is σ = 102483698688. Its totient is φ = 27690575040.

The previous prime is 61771499941. The next prime is 61771499971. The reversal of 61771499966 is 66999417716.

It is a Curzon 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, 466106 + ... + 583778.

It is an arithmetic number, because the mean of its divisors is an integer number (3202615584).

Almost surely, 2^61771499966 is an apocalyptic number.

61771499966 is a deficient number, since it is larger than the sum of its proper divisors (40712198722).

61771499966 is a wasteful number, since it uses less digits than its factorization.

61771499966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118016.

The product of its digits is 30862944, while the sum is 65.

The spelling of 61771499966 in words is "sixty-one billion, seven hundred seventy-one million, four hundred ninety-nine thousand, nine hundred sixty-six".