14477997978 has 12 divisors (see below), whose sum is σ = 31368995658. Its totient is φ = 4825999320.

The previous prime is 14477997949. The next prime is 14477998021. The reversal of 14477997978 is 87979977441.

It is a happy number.

14477997978 is a `hidden beast` number, since 1 + 447 + 7 + 9 + 97 + 97 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14341739049 + 136258929 = 119757^2 + 11673^2 .

It is a super-2 number, since 2×14477997978² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 402166593 + ... + 402166628.

Almost surely, 2^14477997978 is an apocalyptic number.

14477997978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

14477997978 is an abundant number, since it is smaller than the sum of its proper divisors (16890997680).

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

14477997978 is a wasteful number, since it uses less digits than its factorization.

14477997978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804333229 (or 804333226 counting only the distinct ones).

The product of its digits is 224042112, while the sum is 72.

The spelling of 14477997978 in words is "fourteen billion, four hundred seventy-seven million, nine hundred ninety-seven thousand, nine hundred seventy-eight".