2116646665554 has 16 divisors (see below), whose sum is σ = 4265608548960. Its totient is φ = 700163018880.

The previous prime is 2116646665547. The next prime is 2116646665649. The reversal of 2116646665554 is 4555666466112.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2116646665494 and 2116646665503.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1346466559 + ... + 1346468130.

It is an arithmetic number, because the mean of its divisors is an integer number (266600534310).

Almost surely, 2^{2116646665554} is an apocalyptic number.

2116646665554 is an abundant number, since it is smaller than the sum of its proper divisors (2148961883406).

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

2116646665554 is a wasteful number, since it uses less digits than its factorization.

2116646665554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2692934825.

The product of its digits is 31104000, while the sum is 57.

The spelling of 2116646665554 in words is "two trillion, one hundred sixteen billion, six hundred forty-six million, six hundred sixty-five thousand, five hundred fifty-four".