16545723542478 has 24 divisors (see below), whose sum is σ = 38606688266328. Its totient is φ = 5090991859152.

The previous prime is 16545723542477. The next prime is 16545723542503. The reversal of 16545723542478 is 87424532754561.

16545723542478 is a `hidden beast` number, since 1 + 6 + 5 + 4 + 572 + 3 + 54 + 2 + 4 + 7 + 8 = 666.

It is a super-2 number, since 2×16545723542478² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16545723542471) 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, 35354109900 + ... + 35354110367.

It is an arithmetic number, because the mean of its divisors is an integer number (1608612011097).

Almost surely, 2^{16545723542478} is an apocalyptic number.

16545723542478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

16545723542478 is an abundant number, since it is smaller than the sum of its proper divisors (22060964723850).

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

16545723542478 is a wasteful number, since it uses less digits than its factorization.

16545723542478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70708220288 (or 70708220285 counting only the distinct ones).

The product of its digits is 225792000, while the sum is 63.

The spelling of 16545723542478 in words is "sixteen trillion, five hundred forty-five billion, seven hundred twenty-three million, five hundred forty-two thousand, four hundred seventy-eight".