18534510551778 has 32 divisors (see below), whose sum is σ = 39983749798272. Its totient is φ = 5693888390400.

The previous prime is 18534510551747. The next prime is 18534510551801. The reversal of 18534510551778 is 87715501543581.

It is a super-2 number, since 2×18534510551778² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188240743 + ... + 188339178.

It is an arithmetic number, because the mean of its divisors is an integer number (1249492181196).

Almost surely, 2^{18534510551778} is an apocalyptic number.

18534510551778 is an abundant number, since it is smaller than the sum of its proper divisors (21449239246494).

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

18534510551778 is a wasteful number, since it uses less digits than its factorization.

18534510551778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376580570.

The product of its (nonzero) digits is 23520000, while the sum is 60.

The spelling of 18534510551778 in words is "eighteen trillion, five hundred thirty-four billion, five hundred ten million, five hundred fifty-one thousand, seven hundred seventy-eight".