1662521123 has 2 divisors, whose sum is σ = 1662521124. Its totient is φ = 1662521122.

The previous prime is 1662521051. The next prime is 1662521141. The reversal of 1662521123 is 3211252661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1662521123 - 2²² = 1658326819 is a prime.

It is a super-2 number, since 2×1662521123² = 5527952968842362258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1662521173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831260561 + 831260562.

It is an arithmetic number, because the mean of its divisors is an integer number (831260562).

Almost surely, 2^1662521123 is an apocalyptic number.

1662521123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1662521123 is an equidigital number, since it uses as much as digits as its factorization.

1662521123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 29.

The square root of 1662521123 is about 40774.0251017728. The cubic root of 1662521123 is about 1184.6472682397.

Adding to 1662521123 its reverse (3211252661), we get a palindrome (4873773784).

The spelling of 1662521123 in words is "one billion, six hundred sixty-two million, five hundred twenty-one thousand, one hundred twenty-three".