2166545862478 has 8 divisors (see below), whose sum is σ = 3250050123240. Its totient is φ = 1083195821400.

The previous prime is 2166545862473. The next prime is 2166545862487. The reversal of 2166545862478 is 8742685456612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166545862473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38519793 + ... + 38575996.

It is an arithmetic number, because the mean of its divisors is an integer number (406256265405).

Almost surely, 2^{2166545862478} is an apocalyptic number.

2166545862478 is a deficient number, since it is larger than the sum of its proper divisors (1083504260762).

2166545862478 is a wasteful number, since it uses less digits than its factorization.

2166545862478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77109842.

The product of its digits is 154828800, while the sum is 64.

The spelling of 2166545862478 in words is "two trillion, one hundred sixty-six billion, five hundred forty-five million, eight hundred sixty-two thousand, four hundred seventy-eight".