40842015210781 has 2 divisors, whose sum is σ = 40842015210782. Its totient is φ = 40842015210780.

The previous prime is 40842015210769. The next prime is 40842015210791. The reversal of 40842015210781 is 18701251024804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32967509326756 + 7874505884025 = 5741734^2 + 2806155^2 .

It is a cyclic number.

It is not a de Polignac number, because 40842015210781 - 2¹¹ = 40842015208733 is a prime.

It is a super-2 number, since 2×40842015210781² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40842015210791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20421007605390 + 20421007605391.

It is an arithmetic number, because the mean of its divisors is an integer number (20421007605391).

Almost surely, 2^{40842015210781} is an apocalyptic number.

It is an amenable number.

40842015210781 is a deficient number, since it is larger than the sum of its proper divisors (1).

40842015210781 is an equidigital number, since it uses as much as digits as its factorization.

40842015210781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 143360, while the sum is 43.

The spelling of 40842015210781 in words is "forty trillion, eight hundred forty-two billion, fifteen million, two hundred ten thousand, seven hundred eighty-one".