18874677801661 has 12 divisors (see below), whose sum is σ = 20747021230656. Its totient is φ = 17158405511720.

The previous prime is 18874677801643. The next prime is 18874677801671. The reversal of 18874677801661 is 16610877647881.

It is not a de Polignac number, because 18874677801661 - 2⁹ = 18874677801149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18874677801611) 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, 3594396 + ... + 7118218.

It is an arithmetic number, because the mean of its divisors is an integer number (1728918435888).

Almost surely, 2^{18874677801661} is an apocalyptic number.

18874677801661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18874677801661 is a deficient number, since it is larger than the sum of its proper divisors (1872343428995).

18874677801661 is a wasteful number, since it uses less digits than its factorization.

18874677801661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3568112 (or 3568101 counting only the distinct ones).

The product of its (nonzero) digits is 151732224, while the sum is 70.

The spelling of 18874677801661 in words is "eighteen trillion, eight hundred seventy-four billion, six hundred seventy-seven million, eight hundred one thousand, six hundred sixty-one".