36556221451 has 2 divisors, whose sum is σ = 36556221452. Its totient is φ = 36556221450.

The previous prime is 36556221433. The next prime is 36556221463. The reversal of 36556221451 is 15412265563.

It is a strong prime.

It is an emirp because it is prime and its reverse (15412265563) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 36556221451 - 2⁷ = 36556221323 is a prime.

It is not a weakly prime, because it can be changed into another prime (36556221491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18278110725 + 18278110726.

It is an arithmetic number, because the mean of its divisors is an integer number (18278110726).

Almost surely, 2^36556221451 is an apocalyptic number.

36556221451 is a deficient number, since it is larger than the sum of its proper divisors (1).

36556221451 is an equidigital number, since it uses as much as digits as its factorization.

36556221451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216000, while the sum is 40.

The spelling of 36556221451 in words is "thirty-six billion, five hundred fifty-six million, two hundred twenty-one thousand, four hundred fifty-one".