1959666669591 has 32 divisors (see below), whose sum is σ = 2708567769600. Its totient is φ = 1259268301440.

The previous prime is 1959666669577. The next prime is 1959666669613.

It is a happy number.

1959666669591 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1959666669591 - 2¹⁰ = 1959666668567 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1959666669491) 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, 117823846 + ... + 117840476.

It is an arithmetic number, because the mean of its divisors is an integer number (84642742800).

Almost surely, 2^{1959666669591} is an apocalyptic number.

1959666669591 is a deficient number, since it is larger than the sum of its proper divisors (748901100009).

1959666669591 is a wasteful number, since it uses less digits than its factorization.

1959666669591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26519.

The product of its digits is 1275458400, while the sum is 78.

The spelling of 1959666669591 in words is "one trillion, nine hundred fifty-nine billion, six hundred sixty-six million, six hundred sixty-nine thousand, five hundred ninety-one".