1858142661 has 4 divisors (see below), whose sum is σ = 2477523552. Its totient is φ = 1238761772.

The previous prime is 1858142651. The next prime is 1858142681. The reversal of 1858142661 is 1662418581.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1858142661 - 2⁹ = 1858142149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1858142651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 309690441 + ... + 309690446.

It is an arithmetic number, because the mean of its divisors is an integer number (619380888).

Almost surely, 2^1858142661 is an apocalyptic number.

It is an amenable number.

1858142661 is a deficient number, since it is larger than the sum of its proper divisors (619380891).

1858142661 is an equidigital number, since it uses as much as digits as its factorization.

1858142661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619380890.

The product of its digits is 92160, while the sum is 42.

The square root of 1858142661 is about 43106.1789190367. The cubic root of 1858142661 is about 1229.3994602916.

The spelling of 1858142661 in words is "one billion, eight hundred fifty-eight million, one hundred forty-two thousand, six hundred sixty-one".