36240720781 has 2 divisors, whose sum is σ = 36240720782. Its totient is φ = 36240720780.

The previous prime is 36240720757. The next prime is 36240720809. The reversal of 36240720781 is 18702704263.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31014732100 + 5225988681 = 176110^2 + 72291^2 .

It is a cyclic number.

It is not a de Polignac number, because 36240720781 - 2¹⁷ = 36240589709 is a prime.

It is a super-2 number, since 2×36240720781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36240720731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18120360390 + 18120360391.

It is an arithmetic number, because the mean of its divisors is an integer number (18120360391).

Almost surely, 2^36240720781 is an apocalyptic number.

It is an amenable number.

36240720781 is a deficient number, since it is larger than the sum of its proper divisors (1).

36240720781 is an equidigital number, since it uses as much as digits as its factorization.

36240720781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112896, while the sum is 40.

The spelling of 36240720781 in words is "thirty-six billion, two hundred forty million, seven hundred twenty thousand, seven hundred eighty-one".