36658513781 has 2 divisors, whose sum is σ = 36658513782. Its totient is φ = 36658513780.

The previous prime is 36658513777. The next prime is 36658513789. The reversal of 36658513781 is 18731585663.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34527214225 + 2131299556 = 185815^2 + 46166^2 .

It is a cyclic number.

It is not a de Polignac number, because 36658513781 - 2² = 36658513777 is a prime.

It is a super-2 number, since 2×36658513781² (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 (36658513789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18329256890 + 18329256891.

It is an arithmetic number, because the mean of its divisors is an integer number (18329256891).

Almost surely, 2^36658513781 is an apocalyptic number.

It is an amenable number.

36658513781 is a deficient number, since it is larger than the sum of its proper divisors (1).

36658513781 is an equidigital number, since it uses as much as digits as its factorization.

36658513781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3628800, while the sum is 53.

The spelling of 36658513781 in words is "thirty-six billion, six hundred fifty-eight million, five hundred thirteen thousand, seven hundred eighty-one".