1861666674 has 32 divisors (see below), whose sum is σ = 4259350656. Its totient is φ = 531390720.

The previous prime is 1861666673. The next prime is 1861666771. The reversal of 1861666674 is 4766661681.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1861666673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23674 + ... + 65450.

It is an arithmetic number, because the mean of its divisors is an integer number (133104708).

Almost surely, 2^1861666674 is an apocalyptic number.

1861666674 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1861666674 is an abundant number, since it is smaller than the sum of its proper divisors (2397683982).

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

1861666674 is a wasteful number, since it uses less digits than its factorization.

1861666674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42850.

The product of its digits is 1741824, while the sum is 51.

The square root of 1861666674 is about 43147.0355180979. The cubic root of 1861666674 is about 1230.1761648663.

The spelling of 1861666674 in words is "one billion, eight hundred sixty-one million, six hundred sixty-six thousand, six hundred seventy-four".