36776768621 has 2 divisors, whose sum is σ = 36776768622. Its totient is φ = 36776768620.

The previous prime is 36776768569. The next prime is 36776768653. The reversal of 36776768621 is 12686767763.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36637788100 + 138980521 = 191410^2 + 11789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-36776768621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36776761621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18388384310 + 18388384311.

It is an arithmetic number, because the mean of its divisors is an integer number (18388384311).

Almost surely, 2^36776768621 is an apocalyptic number.

It is an amenable number.

36776768621 is a deficient number, since it is larger than the sum of its proper divisors (1).

36776768621 is an equidigital number, since it uses as much as digits as its factorization.

36776768621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21337344, while the sum is 59.

The spelling of 36776768621 in words is "thirty-six billion, seven hundred seventy-six million, seven hundred sixty-eight thousand, six hundred twenty-one".