13566778452 has 36 divisors (see below), whose sum is σ = 35563944416. Its totient is φ = 4522259160.

The previous prime is 13566778451. The next prime is 13566778453. The reversal of 13566778452 is 25487766531.

13566778452 is a `hidden beast` number, since 1 + 3 + 566 + 7 + 78 + 4 + 5 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (13566778451) and next prime (13566778453).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13566778451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6977824 + ... + 6979767.

Almost surely, 2^13566778452 is an apocalyptic number.

13566778452 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

13566778452 is an abundant number, since it is smaller than the sum of its proper divisors (21997165964).

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

13566778452 is a wasteful number, since it uses less digits than its factorization.

13566778452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13957610 (or 13957596 counting only the distinct ones).

The product of its digits is 8467200, while the sum is 54.

The spelling of 13566778452 in words is "thirteen billion, five hundred sixty-six million, seven hundred seventy-eight thousand, four hundred fifty-two".