13451579978 has 16 divisors (see below), whose sum is σ = 20228087880. Its totient is φ = 6708903936.

The previous prime is 13451579971. The next prime is 13451580011. The reversal of 13451579978 is 87997515431.

It can be written as a sum of positive squares in 4 ways, for example, as 12638930929 + 812649049 = 112423^2 + 28507^2 .

It is not an unprimeable number, because it can be changed into a prime (13451579971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1690826 + ... + 1698762.

Almost surely, 2^13451579978 is an apocalyptic number.

13451579978 is a deficient number, since it is larger than the sum of its proper divisors (6776507902).

13451579978 is a wasteful number, since it uses less digits than its factorization.

13451579978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9961.

The product of its digits is 9525600, while the sum is 59.

The spelling of 13451579978 in words is "thirteen billion, four hundred fifty-one million, five hundred seventy-nine thousand, nine hundred seventy-eight".