1666415264 has 12 divisors (see below), whose sum is σ = 3280755114. Its totient is φ = 833207616.

The previous prime is 1666415209. The next prime is 1666415269. The reversal of 1666415264 is 4625146661.

It can be written as a sum of positive squares in only one way, i.e., 1494595600 + 171819664 = 38660^2 + 13108^2 .

It is not an unprimeable number, because it can be changed into a prime (1666415269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26037707 + ... + 26037770.

Almost surely, 2^1666415264 is an apocalyptic number.

It is an amenable number.

1666415264 is a deficient number, since it is larger than the sum of its proper divisors (1614339850).

1666415264 is an equidigital number, since it uses as much as digits as its factorization.

1666415264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52075487 (or 52075479 counting only the distinct ones).

The product of its digits is 207360, while the sum is 41.

The square root of 1666415264 is about 40821.7498889991. The cubic root of 1666415264 is about 1185.5714843349.

The spelling of 1666415264 in words is "one billion, six hundred sixty-six million, four hundred fifteen thousand, two hundred sixty-four".