12961534478 has 16 divisors (see below), whose sum is σ = 19684546560. Its totient is φ = 6400082616.

The previous prime is 12961534457. The next prime is 12961534489. The reversal of 12961534478 is 87443516921.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 431513 + ... + 460571.

It is an arithmetic number, because the mean of its divisors is an integer number (1230284160).

Almost surely, 2^12961534478 is an apocalyptic number.

12961534478 is a deficient number, since it is larger than the sum of its proper divisors (6723012082).

12961534478 is a wasteful number, since it uses less digits than its factorization.

12961534478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31831.

The product of its digits is 1451520, while the sum is 50.

The spelling of 12961534478 in words is "twelve billion, nine hundred sixty-one million, five hundred thirty-four thousand, four hundred seventy-eight".