15687861406 has 32 divisors (see below), whose sum is σ = 27802272960. Its totient is φ = 6499180800.

The previous prime is 15687861401. The next prime is 15687861421. The reversal of 15687861406 is 60416878651.

15687861406 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×15687861406² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15687861401) 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 15 ways as a sum of consecutive naturals, for example, 62805 + ... + 187936.

It is an arithmetic number, because the mean of its divisors is an integer number (868821030).

Almost surely, 2^15687861406 is an apocalyptic number.

15687861406 is a deficient number, since it is larger than the sum of its proper divisors (12114411554).

15687861406 is a wasteful number, since it uses less digits than its factorization.

15687861406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250900.

The product of its (nonzero) digits is 1935360, while the sum is 52.

The spelling of 15687861406 in words is "fifteen billion, six hundred eighty-seven million, eight hundred sixty-one thousand, four hundred six".