18628780081507 has 8 divisors (see below), whose sum is σ = 19609295360000. Its totient is φ = 17648270119944.

The previous prime is 18628780081489. The next prime is 18628780081511. The reversal of 18628780081507 is 70518008782681.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18628780081507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18628780081547) 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, 7298494 + ... + 9514492.

It is an arithmetic number, because the mean of its divisors is an integer number (2451161920000).

Almost surely, 2^{18628780081507} is an apocalyptic number.

18628780081507 is a deficient number, since it is larger than the sum of its proper divisors (980515278493).

18628780081507 is a wasteful number, since it uses less digits than its factorization.

18628780081507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2658465.

The product of its (nonzero) digits is 12042240, while the sum is 61.

The spelling of 18628780081507 in words is "eighteen trillion, six hundred twenty-eight billion, seven hundred eighty million, eighty-one thousand, five hundred seven".