2145880801666 has 32 divisors (see below), whose sum is σ = 3695733100800. Its totient is φ = 915402249216.

The previous prime is 2145880801657. The next prime is 2145880801703. The reversal of 2145880801666 is 6661080885412.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2446426 + ... + 3205738.

It is an arithmetic number, because the mean of its divisors is an integer number (115491659400).

Almost surely, 2^{2145880801666} is an apocalyptic number.

2145880801666 is a deficient number, since it is larger than the sum of its proper divisors (1549852299134).

2145880801666 is a wasteful number, since it uses less digits than its factorization.

2145880801666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760258.

The product of its (nonzero) digits is 4423680, while the sum is 55.

The spelling of 2145880801666 in words is "two trillion, one hundred forty-five billion, eight hundred eighty million, eight hundred one thousand, six hundred sixty-six".