40665345149969 has 2 divisors, whose sum is σ = 40665345149970. Its totient is φ = 40665345149968.

The previous prime is 40665345149941. The next prime is 40665345150043. The reversal of 40665345149969 is 96994154356604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32390747716369 + 8274597433600 = 5691287^2 + 2876560^2 .

It is a cyclic number.

It is not a de Polignac number, because 40665345149969 - 2¹⁶ = 40665345084433 is a prime.

It is a super-2 number, since 2×40665345149969² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40665345149929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20332672574984 + 20332672574985.

It is an arithmetic number, because the mean of its divisors is an integer number (20332672574985).

Almost surely, 2^{40665345149969} is an apocalyptic number.

It is an amenable number.

40665345149969 is a deficient number, since it is larger than the sum of its proper divisors (1).

40665345149969 is an equidigital number, since it uses as much as digits as its factorization.

40665345149969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 755827200, while the sum is 71.

The spelling of 40665345149969 in words is "forty trillion, six hundred sixty-five billion, three hundred forty-five million, one hundred forty-nine thousand, nine hundred sixty-nine".