66126880856 has 16 divisors (see below), whose sum is σ = 125191669200. Its totient is φ = 32742435744.

The previous prime is 66126880843. The next prime is 66126880867. The reversal of 66126880856 is 65808862166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40124711 + ... + 40126358.

It is an arithmetic number, because the mean of its divisors is an integer number (7824479325).

Almost surely, 2^66126880856 is an apocalyptic number.

It is an amenable number.

66126880856 is a deficient number, since it is larger than the sum of its proper divisors (59064788344).

66126880856 is a wasteful number, since it uses less digits than its factorization.

66126880856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80251178 (or 80251174 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 56.

The spelling of 66126880856 in words is "sixty-six billion, one hundred twenty-six million, eight hundred eighty thousand, eight hundred fifty-six".