1662123355 has 4 divisors (see below), whose sum is σ = 1994548032. Its totient is φ = 1329698680.

The previous prime is 1662123347. The next prime is 1662123391. The reversal of 1662123355 is 5533212661.

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

It is not a de Polignac number, because 1662123355 - 2³ = 1662123347 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1662123355.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166212331 + ... + 166212340.

It is an arithmetic number, because the mean of its divisors is an integer number (498637008).

Almost surely, 2^1662123355 is an apocalyptic number.

1662123355 is a deficient number, since it is larger than the sum of its proper divisors (332424677).

1662123355 is an equidigital number, since it uses as much as digits as its factorization.

1662123355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332424676.

The product of its digits is 32400, while the sum is 34.

The square root of 1662123355 is about 40769.1470967937. The cubic root of 1662123355 is about 1184.5527827515.

The spelling of 1662123355 in words is "one billion, six hundred sixty-two million, one hundred twenty-three thousand, three hundred fifty-five".