1662478669 has 2 divisors, whose sum is σ = 1662478670. Its totient is φ = 1662478668.

The previous prime is 1662478639. The next prime is 1662478673. The reversal of 1662478669 is 9668742661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1633210569 + 29268100 = 40413^2 + 5410^2 .

It is an emirp because it is prime and its reverse (9668742661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1662478669 - 2²⁷ = 1528260941 is a prime.

It is a super-2 number, since 2×1662478669² = 5527670649760023122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1662478639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831239334 + 831239335.

It is an arithmetic number, because the mean of its divisors is an integer number (831239335).

Almost surely, 2^1662478669 is an apocalyptic number.

It is an amenable number.

1662478669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1662478669 is an equidigital number, since it uses as much as digits as its factorization.

1662478669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5225472, while the sum is 55.

The square root of 1662478669 is about 40773.5044974062. The cubic root of 1662478669 is about 1184.6371844695.

The spelling of 1662478669 in words is "one billion, six hundred sixty-two million, four hundred seventy-eight thousand, six hundred sixty-nine".