1814873661 has 32 divisors (see below), whose sum is σ = 2724451200. Its totient is φ = 1193938560.

The previous prime is 1814873633. The next prime is 1814873663. The reversal of 1814873661 is 1663784181.

1814873661 is a `hidden beast` number, since 1 + 81 + 487 + 36 + 61 = 666.

It is not a de Polignac number, because 1814873661 - 2¹¹ = 1814871613 is a prime.

It is a super-3 number, since 3×1814873661³ (a number of 29 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1814873663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 660751 + ... + 663491.

It is an arithmetic number, because the mean of its divisors is an integer number (85139100).

Almost surely, 2^1814873661 is an apocalyptic number.

It is an amenable number.

1814873661 is a deficient number, since it is larger than the sum of its proper divisors (909577539).

1814873661 is a wasteful number, since it uses less digits than its factorization.

1814873661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3066 (or 3060 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 1814873661 is about 42601.3340284081. The cubic root of 1814873661 is about 1219.7817537130.

It can be divided in two parts, 18148 and 73661, that added together give a square (91809 = 303²).

The spelling of 1814873661 in words is "one billion, eight hundred fourteen million, eight hundred seventy-three thousand, six hundred sixty-one".