36278791621 has 4 divisors (see below), whose sum is σ = 36313912492. Its totient is φ = 36243670752.

The previous prime is 36278791603. The next prime is 36278791667. The reversal of 36278791621 is 12619787263.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12619787263 = 62039 ⋅203417.

It can be written as a sum of positive squares in 2 ways, for example, as 29865024225 + 6413767396 = 172815^2 + 80086^2 .

It is a cyclic number.

It is not a de Polignac number, because 36278791621 - 2²¹ = 36276694469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36278711621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17558886 + ... + 17560951.

It is an arithmetic number, because the mean of its divisors is an integer number (9078478123).

Almost surely, 2^36278791621 is an apocalyptic number.

It is an amenable number.

36278791621 is a deficient number, since it is larger than the sum of its proper divisors (35120871).

36278791621 is a wasteful number, since it uses less digits than its factorization.

36278791621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35120870.

The product of its digits is 1524096, while the sum is 52.

The spelling of 36278791621 in words is "thirty-six billion, two hundred seventy-eight million, seven hundred ninety-one thousand, six hundred twenty-one".