1666958898013 has 4 divisors (see below), whose sum is σ = 1683142965088. Its totient is φ = 1650774830940.

The previous prime is 1666958897999. The next prime is 1666958898061. The reversal of 1666958898013 is 3108988596661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1666958898013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666958898083) 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, 8092033383 + ... + 8092033588.

It is an arithmetic number, because the mean of its divisors is an integer number (420785741272).

Almost surely, 2^{1666958898013} is an apocalyptic number.

It is an amenable number.

1666958898013 is a deficient number, since it is larger than the sum of its proper divisors (16184067075).

1666958898013 is a wasteful number, since it uses less digits than its factorization.

1666958898013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16184067074.

The product of its (nonzero) digits is 134369280, while the sum is 70.

The spelling of 1666958898013 in words is "one trillion, six hundred sixty-six billion, nine hundred fifty-eight million, eight hundred ninety-eight thousand, thirteen".