1858165473 has 4 divisors (see below), whose sum is σ = 2477553968. Its totient is φ = 1238776980.

The previous prime is 1858165453. The next prime is 1858165499. The reversal of 1858165473 is 3745618581.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3745618581 = 3 ⋅1248539527.

It is not a de Polignac number, because 1858165473 - 2⁶ = 1858165409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1858165453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 309694243 + ... + 309694248.

It is an arithmetic number, because the mean of its divisors is an integer number (619388492).

Almost surely, 2^1858165473 is an apocalyptic number.

It is an amenable number.

1858165473 is a deficient number, since it is larger than the sum of its proper divisors (619388495).

1858165473 is an equidigital number, since it uses as much as digits as its factorization.

1858165473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619388494.

The product of its digits is 806400, while the sum is 48.

The square root of 1858165473 is about 43106.4435206617. The cubic root of 1858165473 is about 1229.4044912914.

It can be divided in two parts, 1858 and 165473, that added together give a triangular number (167331 = T₅₇₈).

The spelling of 1858165473 in words is "one billion, eight hundred fifty-eight million, one hundred sixty-five thousand, four hundred seventy-three".