18687781642552 has 16 divisors (see below), whose sum is σ = 38225007905400. Its totient is φ = 8494446201120.

The previous prime is 18687781642487. The next prime is 18687781642561. The reversal of 18687781642552 is 25524618778681.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106180577427 + ... + 106180577602.

Almost surely, 2^{18687781642552} is an apocalyptic number.

It is an amenable number.

18687781642552 is an abundant number, since it is smaller than the sum of its proper divisors (19537226262848).

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

18687781642552 is a wasteful number, since it uses less digits than its factorization.

18687781642552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212361155046 (or 212361155042 counting only the distinct ones).

The product of its digits is 361267200, while the sum is 70.

The spelling of 18687781642552 in words is "eighteen trillion, six hundred eighty-seven billion, seven hundred eighty-one million, six hundred forty-two thousand, five hundred fifty-two".