1615130666 has 4 divisors (see below), whose sum is σ = 2422696002. Its totient is φ = 807565332.

The previous prime is 1615130567. The next prime is 1615130687. The reversal of 1615130666 is 6660315161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1189905025 + 425225641 = 34495^2 + 20621^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403782665 + ... + 403782668.

Almost surely, 2^1615130666 is an apocalyptic number.

1615130666 is a deficient number, since it is larger than the sum of its proper divisors (807565336).

1615130666 is an equidigital number, since it uses as much as digits as its factorization.

1615130666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807565335.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 1615130666 is about 40188.6882841428. The cubic root of 1615130666 is about 1173.2823954693.

The spelling of 1615130666 in words is "one billion, six hundred fifteen million, one hundred thirty thousand, six hundred sixty-six".