15666666949 has 8 divisors (see below), whose sum is σ = 15700269312. Its totient is φ = 15633095280.

The previous prime is 15666666877. The next prime is 15666666971. The reversal of 15666666949 is 94966666651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15666666949 - 2¹¹ = 15666664901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15666636949) 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, 1215352 + ... + 1228174.

It is an arithmetic number, because the mean of its divisors is an integer number (1962533664).

Almost surely, 2^15666666949 is an apocalyptic number.

It is an amenable number.

15666666949 is a deficient number, since it is larger than the sum of its proper divisors (33602363).

15666666949 is a wasteful number, since it uses less digits than its factorization.

15666666949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15347.

The product of its digits is 75582720, while the sum is 64.

The spelling of 15666666949 in words is "fifteen billion, six hundred sixty-six million, six hundred sixty-six thousand, nine hundred forty-nine".