2166542768408 has 8 divisors (see below), whose sum is σ = 4062267690780. Its totient is φ = 1083271384200.

The previous prime is 2166542768347. The next prime is 2166542768413. The reversal of 2166542768408 is 8048672456612.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-4 number, since 4×2166542768408⁴ (a number of 50 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 135408923018 + ... + 135408923033.

Almost surely, 2^{2166542768408} is an apocalyptic number.

It is an amenable number.

2166542768408 is a deficient number, since it is larger than the sum of its proper divisors (1895724922372).

2166542768408 is a wasteful number, since it uses less digits than its factorization.

2166542768408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270817846057 (or 270817846053 counting only the distinct ones).

The product of its (nonzero) digits is 30965760, while the sum is 59.

The spelling of 2166542768408 in words is "two trillion, one hundred sixty-six billion, five hundred forty-two million, seven hundred sixty-eight thousand, four hundred eight".