1955559823 has 4 divisors (see below), whose sum is σ = 2234925520. Its totient is φ = 1676194128.

The previous prime is 1955559817. The next prime is 1955559833. The reversal of 1955559823 is 3289555591.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1955559823 - 2⁹ = 1955559311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1955559833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139682838 + ... + 139682851.

It is an arithmetic number, because the mean of its divisors is an integer number (558731380).

Almost surely, 2^1955559823 is an apocalyptic number.

1955559823 is a deficient number, since it is larger than the sum of its proper divisors (279365697).

1955559823 is an equidigital number, since it uses as much as digits as its factorization.

1955559823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279365696.

The product of its digits is 2430000, while the sum is 52.

The square root of 1955559823 is about 44221.7121219882. The cubic root of 1955559823 is about 1250.5192132109.

The spelling of 1955559823 in words is "one billion, nine hundred fifty-five million, five hundred fifty-nine thousand, eight hundred twenty-three".