1866080681 has 8 divisors (see below), whose sum is σ = 1978339584. Its totient is φ = 1757075760.

The previous prime is 1866080669. The next prime is 1866080731. The reversal of 1866080681 is 1860806681.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1866080681 - 2³⁰ = 792338857 is a prime.

It is a super-2 number, since 2×1866080681² = 6964514216002847522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1866080641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 812315 + ... + 814608.

It is an arithmetic number, because the mean of its divisors is an integer number (247292448).

Almost surely, 2^1866080681 is an apocalyptic number.

It is an amenable number.

1866080681 is a deficient number, since it is larger than the sum of its proper divisors (112258903).

1866080681 is a wasteful number, since it uses less digits than its factorization.

1866080681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1626991.

The product of its (nonzero) digits is 110592, while the sum is 44.

The square root of 1866080681 is about 43198.1559907365. The cubic root of 1866080681 is about 1231.1476456748.

The spelling of 1866080681 in words is "one billion, eight hundred sixty-six million, eighty thousand, six hundred eighty-one".