61666546456 has 8 divisors (see below), whose sum is σ = 115624774620. Its totient is φ = 30833273224.

The previous prime is 61666546391. The next prime is 61666546483. The reversal of 61666546456 is 65464566616.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 61666546397 and 61666546406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3854159146 + ... + 3854159161.

Almost surely, 2^61666546456 is an apocalyptic number.

It is an amenable number.

61666546456 is a deficient number, since it is larger than the sum of its proper divisors (53958228164).

61666546456 is a wasteful number, since it uses less digits than its factorization.

61666546456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7708318313 (or 7708318309 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 55.

The spelling of 61666546456 in words is "sixty-one billion, six hundred sixty-six million, five hundred forty-six thousand, four hundred fifty-six".