15378916666247 has 4 divisors (see below), whose sum is σ = 15397879572936. Its totient is φ = 15359953759560.

The previous prime is 15378916666189. The next prime is 15378916666277. The reversal of 15378916666247 is 74266661987351.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15378916666247 is a prime.

It is a super-2 number, since 2×15378916666247² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15378916666277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9481452128 + ... + 9481453749.

It is an arithmetic number, because the mean of its divisors is an integer number (3849469893234).

Almost surely, 2^{15378916666247} is an apocalyptic number.

15378916666247 is a deficient number, since it is larger than the sum of its proper divisors (18962906689).

15378916666247 is an equidigital number, since it uses as much as digits as its factorization.

15378916666247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18962906688.

The product of its digits is 548674560, while the sum is 71.

The spelling of 15378916666247 in words is "fifteen trillion, three hundred seventy-eight billion, nine hundred sixteen million, six hundred sixty-six thousand, two hundred forty-seven".