2155666105000 has 40 divisors (see below), whose sum is σ = 5050725695730. Its totient is φ = 862266440000.

The previous prime is 2155666104881. The next prime is 2155666105009. The reversal of 2155666105000 is 5016665512.

It can be written as a sum of positive squares in 5 ways, for example, as 1857437604 + 2153808667396 = 43098^2 + 1467586^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (2155666105009) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 215561611 + ... + 215571610.

Almost surely, 2^{2155666105000} is an apocalyptic number.

2155666105000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155666105000 is an abundant number, since it is smaller than the sum of its proper divisors (2895059590730).

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

2155666105000 is an equidigital number, since it uses as much as digits as its factorization.

2155666105000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431133247 (or 431133228 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 37.

The spelling of 2155666105000 in words is "two trillion, one hundred fifty-five billion, six hundred sixty-six million, one hundred five thousand".