15785878106 has 4 divisors (see below), whose sum is σ = 23678817162. Its totient is φ = 7892939052.

The previous prime is 15785878103. The next prime is 15785878127. The reversal of 15785878106 is 60187858751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60187858751 = 643 ⋅93604757.

It can be written as a sum of positive squares in only one way, i.e., 12684390625 + 3101487481 = 112625^2 + 55691^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15785878103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3946469525 + ... + 3946469528.

Almost surely, 2^15785878106 is an apocalyptic number.

15785878106 is a deficient number, since it is larger than the sum of its proper divisors (7892939056).

15785878106 is an equidigital number, since it uses as much as digits as its factorization.

15785878106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7892939055.

The product of its (nonzero) digits is 3763200, while the sum is 56.

The spelling of 15785878106 in words is "fifteen billion, seven hundred eighty-five million, eight hundred seventy-eight thousand, one hundred six".