1861668011 has 8 divisors (see below), whose sum is σ = 2252774880. Its totient is φ = 1501849728.

The previous prime is 1861667957. The next prime is 1861668019. The reversal of 1861668011 is 1108661681.

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 1861668011 - 2²⁶ = 1794559147 is a prime.

It is a super-2 number, since 2×1861668011² = 6931615566361392242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1861668019) 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, 7822016 + ... + 7822253.

It is an arithmetic number, because the mean of its divisors is an integer number (281596860).

Almost surely, 2^1861668011 is an apocalyptic number.

1861668011 is a deficient number, since it is larger than the sum of its proper divisors (391106869).

1861668011 is a wasteful number, since it uses less digits than its factorization.

1861668011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15644293.

The product of its (nonzero) digits is 13824, while the sum is 38.

The square root of 1861668011 is about 43147.0510116277. The cubic root of 1861668011 is about 1230.1764593596.

The spelling of 1861668011 in words is "one billion, eight hundred sixty-one million, six hundred sixty-eight thousand, eleven".