15955687478 has 4 divisors (see below), whose sum is σ = 23933531220. Its totient is φ = 7977843738.

The previous prime is 15955687477. The next prime is 15955687487. The reversal of 15955687478 is 87478655951.

15955687478 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87478655951 = 439 ⋅199268009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15955687477) 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 as a sum of consecutive naturals, namely, 3988921868 + ... + 3988921871.

It is an arithmetic number, because the mean of its divisors is an integer number (5983382805).

Almost surely, 2^15955687478 is an apocalyptic number.

15955687478 is a deficient number, since it is larger than the sum of its proper divisors (7977843742).

15955687478 is an equidigital number, since it uses as much as digits as its factorization.

15955687478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7977843741.

The product of its digits is 84672000, while the sum is 65.

The spelling of 15955687478 in words is "fifteen billion, nine hundred fifty-five million, six hundred eighty-seven thousand, four hundred seventy-eight".