1664666476 has 24 divisors (see below), whose sum is σ = 3180300480. Its totient is φ = 756118800.

The previous prime is 1664666459. The next prime is 1664666477. The reversal of 1664666476 is 6746664661.

It is a super-2 number, since 2×1664666476² = 5542228952636517152, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1664666477) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51231 + ... + 77161.

It is an arithmetic number, because the mean of its divisors is an integer number (132512520).

Almost surely, 2^1664666476 is an apocalyptic number.

It is an amenable number.

1664666476 is a deficient number, since it is larger than the sum of its proper divisors (1515634004).

1664666476 is a wasteful number, since it uses less digits than its factorization.

1664666476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27405 (or 27403 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 52.

The square root of 1664666476 is about 40800.3244594942. The cubic root of 1664666476 is about 1185.1566139803.

The spelling of 1664666476 in words is "one billion, six hundred sixty-four million, six hundred sixty-six thousand, four hundred seventy-six".