2031987666869 has 2 divisors, whose sum is σ = 2031987666870. Its totient is φ = 2031987666868.

The previous prime is 2031987666817. The next prime is 2031987666887. The reversal of 2031987666869 is 9686667891302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2031944764369 + 42902500 = 1425463^2 + 6550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2031987666869 is a prime.

It is a super-2 number, since 2×2031987666869² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2031987666889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1015993833434 + 1015993833435.

It is an arithmetic number, because the mean of its divisors is an integer number (1015993833435).

Almost surely, 2^{2031987666869} is an apocalyptic number.

It is an amenable number.

2031987666869 is a deficient number, since it is larger than the sum of its proper divisors (1).

2031987666869 is an equidigital number, since it uses as much as digits as its factorization.

2031987666869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282175488, while the sum is 71.

The spelling of 2031987666869 in words is "two trillion, thirty-one billion, nine hundred eighty-seven million, six hundred sixty-six thousand, eight hundred sixty-nine".