1661877822 has 32 divisors (see below), whose sum is σ = 3742884864. Its totient is φ = 487353600.

The previous prime is 1661877797. The next prime is 1661877851. The reversal of 1661877822 is 2287781661.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 404083 + ... + 408174.

It is an arithmetic number, because the mean of its divisors is an integer number (116965152).

Almost surely, 2^1661877822 is an apocalyptic number.

1661877822 is an abundant number, since it is smaller than the sum of its proper divisors (2081007042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1661877822 is a wasteful number, since it uses less digits than its factorization.

1661877822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812304.

The product of its digits is 451584, while the sum is 48.

The square root of 1661877822 is about 40766.1357256240. The cubic root of 1661877822 is about 1184.4944515171.

The spelling of 1661877822 in words is "one billion, six hundred sixty-one million, eight hundred seventy-seven thousand, eight hundred twenty-two".