61806555808 has 24 divisors (see below), whose sum is σ = 121857795360. Its totient is φ = 30858544320.

The previous prime is 61806555781. The next prime is 61806555871. The reversal of 61806555808 is 80855560816.

61806555808 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 1375468 + ... + 1419691.

It is an arithmetic number, because the mean of its divisors is an integer number (5077408140).

Almost surely, 2^61806555808 is an apocalyptic number.

It is an amenable number.

61806555808 is a deficient number, since it is larger than the sum of its proper divisors (60051239552).

61806555808 is a wasteful number, since it uses less digits than its factorization.

61806555808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2795860 (or 2795852 counting only the distinct ones).

The product of its (nonzero) digits is 2304000, while the sum is 52.

The spelling of 61806555808 in words is "sixty-one billion, eight hundred six million, five hundred fifty-five thousand, eight hundred eight".