61866809120 has 48 divisors (see below), whose sum is σ = 150875198208. Its totient is φ = 23948440320.

The previous prime is 61866809111. The next prime is 61866809153. The reversal of 61866809120 is 2190866816.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6231614 + ... + 6241533.

It is an arithmetic number, because the mean of its divisors is an integer number (3143233296).

Almost surely, 2^61866809120 is an apocalyptic number.

It is an amenable number.

61866809120 is an abundant number, since it is smaller than the sum of its proper divisors (89008389088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61866809120 is a wasteful number, since it uses less digits than its factorization.

61866809120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12473193 (or 12473185 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 47.

The spelling of 61866809120 in words is "sixty-one billion, eight hundred sixty-six million, eight hundred nine thousand, one hundred twenty".