15066666665 has 4 divisors (see below), whose sum is σ = 18080000004. Its totient is φ = 12053333328.

The previous prime is 15066666631. The next prime is 15066666673. The reversal of 15066666665 is 56666666051.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56666666051 = 15803 ⋅3585817.

It can be written as a sum of positive squares in 2 ways, for example, as 8223406489 + 6843260176 = 90683^2 + 82724^2 .

It is a cyclic number.

It is not a de Polignac number, because 15066666665 - 2²² = 15062472361 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1506666662 + ... + 1506666671.

It is an arithmetic number, because the mean of its divisors is an integer number (4520000001).

Almost surely, 2^15066666665 is an apocalyptic number.

It is an amenable number.

15066666665 is a deficient number, since it is larger than the sum of its proper divisors (3013333339).

15066666665 is an equidigital number, since it uses as much as digits as its factorization.

15066666665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3013333338.

The product of its (nonzero) digits is 6998400, while the sum is 53.

The spelling of 15066666665 in words is "fifteen billion, sixty-six million, six hundred sixty-six thousand, six hundred sixty-five".