19613633478978 has 64 divisors (see below), whose sum is σ = 48939746918400. Its totient is φ = 5091010204800.

The previous prime is 19613633478973. The next prime is 19613633479021. The reversal of 19613633478978 is 87987433631691.

It is not an unprimeable number, because it can be changed into a prime (19613633478973) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13648578 + ... + 15017021.

It is an arithmetic number, because the mean of its divisors is an integer number (764683545600).

Almost surely, 2^{19613633478978} is an apocalyptic number.

19613633478978 is an abundant number, since it is smaller than the sum of its proper divisors (29326113439422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19613633478978 is a wasteful number, since it uses less digits than its factorization.

19613633478978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28667103.

The product of its digits is 987614208, while the sum is 75.

The spelling of 19613633478978 in words is "nineteen trillion, six hundred thirteen billion, six hundred thirty-three million, four hundred seventy-eight thousand, nine hundred seventy-eight".