1861627085666 has 8 divisors (see below), whose sum is σ = 2792449197264. Its totient is φ = 930810686580.

The previous prime is 1861627085657. The next prime is 1861627085671. The reversal of 1861627085666 is 6665807261681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1861627085599 and 1861627085608.

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, 490220 + ... + 1990871.

It is an arithmetic number, because the mean of its divisors is an integer number (349056149658).

Almost surely, 2^{1861627085666} is an apocalyptic number.

1861627085666 is a deficient number, since it is larger than the sum of its proper divisors (930822111598).

1861627085666 is a wasteful number, since it uses less digits than its factorization.

1861627085666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2856256.

The product of its (nonzero) digits is 34836480, while the sum is 62.

The spelling of 1861627085666 in words is "one trillion, eight hundred sixty-one billion, six hundred twenty-seven million, eighty-five thousand, six hundred sixty-six".