2166213651546 has 64 divisors (see below), whose sum is σ = 5147813422080. Its totient is φ = 594810311040.

The previous prime is 2166213651541. The next prime is 2166213651571. The reversal of 2166213651546 is 6451563126612.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2166213651495 and 2166213651504.

It is not an unprimeable number, because it can be changed into a prime (2166213651541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9272416 + ... + 9503163.

It is an arithmetic number, because the mean of its divisors is an integer number (80434584720).

Almost surely, 2^{2166213651546} is an apocalyptic number.

2166213651546 is an abundant number, since it is smaller than the sum of its proper divisors (2981599770534).

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

2166213651546 is a wasteful number, since it uses less digits than its factorization.

2166213651546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18775699.

The product of its digits is 1555200, while the sum is 48.

The spelling of 2166213651546 in words is "two trillion, one hundred sixty-six billion, two hundred thirteen million, six hundred fifty-one thousand, five hundred forty-six".