13785503978 has 8 divisors (see below), whose sum is σ = 20678755680. Its totient is φ = 6892585420.

The previous prime is 13785503971. The next prime is 13785503999. The reversal of 13785503978 is 87930558731.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (13785503971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108413 + ... + 198303.

It is an arithmetic number, because the mean of its divisors is an integer number (2584844460).

Almost surely, 2^13785503978 is an apocalyptic number.

13785503978 is a deficient number, since it is larger than the sum of its proper divisors (6893251702).

13785503978 is an equidigital number, since it uses as much as digits as its factorization.

13785503978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166572.

The product of its (nonzero) digits is 6350400, while the sum is 56.

The spelling of 13785503978 in words is "thirteen billion, seven hundred eighty-five million, five hundred three thousand, nine hundred seventy-eight".