1898042661 has 24 divisors (see below), whose sum is σ = 2809622816. Its totient is φ = 1234064160.

The previous prime is 1898042651. The next prime is 1898042701. The reversal of 1898042661 is 1662408981.

It is not a de Polignac number, because 1898042661 - 2⁷ = 1898042533 is a prime.

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 Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1898042621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 280326 + ... + 287016.

Almost surely, 2^1898042661 is an apocalyptic number.

It is an amenable number.

1898042661 is a deficient number, since it is larger than the sum of its proper divisors (911580155).

1898042661 is a wasteful number, since it uses less digits than its factorization.

1898042661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7473 (or 7470 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 1898042661 is about 43566.5314318228. The cubic root of 1898042661 is about 1238.1368701019.

The spelling of 1898042661 in words is "one billion, eight hundred ninety-eight million, forty-two thousand, six hundred sixty-one".