1662423401 has 2 divisors, whose sum is σ = 1662423402. Its totient is φ = 1662423400.

The previous prime is 1662423397. The next prime is 1662423403. The reversal of 1662423401 is 1043242661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1482327001 + 180096400 = 38501^2 + 13420^2 .

It is a cyclic number.

It is not a de Polignac number, because 1662423401 - 2² = 1662423397 is a prime.

Together with 1662423403, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1662423403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831211700 + 831211701.

It is an arithmetic number, because the mean of its divisors is an integer number (831211701).

Almost surely, 2^1662423401 is an apocalyptic number.

It is an amenable number.

1662423401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1662423401 is an equidigital number, since it uses as much as digits as its factorization.

1662423401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 1662423401 is about 40772.8267477250. The cubic root of 1662423401 is about 1184.6240568317.

The spelling of 1662423401 in words is "one billion, six hundred sixty-two million, four hundred twenty-three thousand, four hundred one".