40687869917 has 2 divisors, whose sum is σ = 40687869918. Its totient is φ = 40687869916.

The previous prime is 40687869881. The next prime is 40687870001. The reversal of 40687869917 is 71996878604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37703542276 + 2984327641 = 194174^2 + 54629^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40687869917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40687865917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20343934958 + 20343934959.

It is an arithmetic number, because the mean of its divisors is an integer number (20343934959).

Almost surely, 2^40687869917 is an apocalyptic number.

It is an amenable number.

40687869917 is a deficient number, since it is larger than the sum of its proper divisors (1).

40687869917 is an equidigital number, since it uses as much as digits as its factorization.

40687869917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36578304, while the sum is 65.

The spelling of 40687869917 in words is "forty billion, six hundred eighty-seven million, eight hundred sixty-nine thousand, nine hundred seventeen".