15878643611 has 2 divisors, whose sum is σ = 15878643612. Its totient is φ = 15878643610.

The previous prime is 15878643587. The next prime is 15878643661. The reversal of 15878643611 is 11634687851.

It is a happy number.

It is an a-pointer prime, because the next prime (15878643661) can be obtained adding 15878643611 to its sum of digits (50).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15878643611 - 2²² = 15874449307 is a prime.

It is a super-2 number, since 2×15878643611² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15878643611.

It is not a weakly prime, because it can be changed into another prime (15878643661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7939321805 + 7939321806.

It is an arithmetic number, because the mean of its divisors is an integer number (7939321806).

Almost surely, 2^15878643611 is an apocalyptic number.

15878643611 is a deficient number, since it is larger than the sum of its proper divisors (1).

15878643611 is an equidigital number, since it uses as much as digits as its factorization.

15878643611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 967680, while the sum is 50.

The spelling of 15878643611 in words is "fifteen billion, eight hundred seventy-eight million, six hundred forty-three thousand, six hundred eleven".