15661167 has 4 divisors (see below), whose sum is σ = 20881560. Its totient is φ = 10440776.

The previous prime is 15661153. The next prime is 15661193. The reversal of 15661167 is 76116651.

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

It is a cyclic number.

It is not a de Polignac number, because 15661167 - 2¹⁰ = 15660143 is a prime.

It is a super-3 number, since 3×15661167³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15661117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2610192 + ... + 2610197.

It is an arithmetic number, because the mean of its divisors is an integer number (5220390).

Almost surely, 2^15661167 is an apocalyptic number.

15661167 is a deficient number, since it is larger than the sum of its proper divisors (5220393).

15661167 is an equidigital number, since it uses as much as digits as its factorization.

15661167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5220392.

The product of its digits is 7560, while the sum is 33.

The square root of 15661167 is about 3957.4192348044. The cubic root of 15661167 is about 250.1927420305.

The spelling of 15661167 in words is "fifteen million, six hundred sixty-one thousand, one hundred sixty-seven".