1866634081 has 16 divisors (see below), whose sum is σ = 2117707200. Its totient is φ = 1631060928.

The previous prime is 1866634079. The next prime is 1866634087. The reversal of 1866634081 is 1804366681.

It is a happy number.

It is not a de Polignac number, because 1866634081 - 2¹ = 1866634079 is a prime.

It is a super-2 number, since 2×1866634081² = 6968645584701429122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1866634087) 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, 439275 + ... + 443503.

It is an arithmetic number, because the mean of its divisors is an integer number (132356700).

Almost surely, 2^1866634081 is an apocalyptic number.

It is an amenable number.

1866634081 is a deficient number, since it is larger than the sum of its proper divisors (251073119).

1866634081 is a wasteful number, since it uses less digits than its factorization.

1866634081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6048.

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 1866634081 is about 43204.5608819254. The cubic root of 1866634081 is about 1231.2693356201.

The spelling of 1866634081 in words is "one billion, eight hundred sixty-six million, six hundred thirty-four thousand, eighty-one".