18781625545 has 8 divisors (see below), whose sum is σ = 23517861696. Its totient is φ = 14372026416.

The previous prime is 18781625543. The next prime is 18781625567. The reversal of 18781625545 is 54552618781.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18781625545 - 2¹ = 18781625543 is a prime.

It is a super-2 number, since 2×18781625545² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18781625492 and 18781625501.

It is not an unprimeable number, because it can be changed into a prime (18781625543) 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, 81659127 + ... + 81659356.

It is an arithmetic number, because the mean of its divisors is an integer number (2939732712).

Almost surely, 2^18781625545 is an apocalyptic number.

It is an amenable number.

18781625545 is a deficient number, since it is larger than the sum of its proper divisors (4736236151).

18781625545 is a wasteful number, since it uses less digits than its factorization.

18781625545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163318511.

The product of its digits is 2688000, while the sum is 52.

The spelling of 18781625545 in words is "eighteen billion, seven hundred eighty-one million, six hundred twenty-five thousand, five hundred forty-five".