2116545220638 has 12 divisors (see below), whose sum is σ = 4585847978088. Its totient is φ = 705515073540.

The previous prime is 2116545220631. The next prime is 2116545220639. The reversal of 2116545220638 is 8360225456112.

2116545220638 is a `hidden beast` number, since 2 + 1 + 1 + 6 + 5 + 4 + 5 + 2 + 2 + 0 + 638 = 666.

It is a super-2 number, since 2×2116545220638² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2116545220593 and 2116545220602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2116545220631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 58792922778 + ... + 58792922813.

It is an arithmetic number, because the mean of its divisors is an integer number (382153998174).

Almost surely, 2^{2116545220638} is an apocalyptic number.

2116545220638 is an abundant number, since it is smaller than the sum of its proper divisors (2469302757450).

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

2116545220638 is a wasteful number, since it uses less digits than its factorization.

2116545220638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117585845599 (or 117585845596 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 2116545220638 in words is "two trillion, one hundred sixteen billion, five hundred forty-five million, two hundred twenty thousand, six hundred thirty-eight".