15778472748492 has 18 divisors (see below), whose sum is σ = 36816468520188. Its totient is φ = 5259486329448.

The previous prime is 15778472748443. The next prime is 15778472748499. The reversal of 15778472748492 is 29484727487751.

It is a happy number.

It is a Smith number, since the sum of its digits (75) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (15778472748499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13186809 + ... + 14333487.

Almost surely, 2^{15778472748492} is an apocalyptic number.

15778472748492 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

15778472748492 is an abundant number, since it is smaller than the sum of its proper divisors (21037995771696).

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

15778472748492 is an frugal number, since it uses more digits than its factorization.

15778472748492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2293365 (or 1146684 counting only the distinct ones).

The product of its digits is 1770209280, while the sum is 75.

The spelling of 15778472748492 in words is "fifteen trillion, seven hundred seventy-eight billion, four hundred seventy-two million, seven hundred forty-eight thousand, four hundred ninety-two".