1636221115441 has 4 divisors (see below), whose sum is σ = 1784968489584. Its totient is φ = 1487473741300.

The previous prime is 1636221115439. The next prime is 1636221115457. The reversal of 1636221115441 is 1445111226361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1636221115441 - 2¹ = 1636221115439 is a prime.

It is a super-3 number, since 3×1636221115441³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1636221115441.

It is not an unprimeable number, because it can be changed into a prime (1636221115241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74373687055 + ... + 74373687076.

It is an arithmetic number, because the mean of its divisors is an integer number (446242122396).

Almost surely, 2^{1636221115441} is an apocalyptic number.

1636221115441 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1636221115441 is a deficient number, since it is larger than the sum of its proper divisors (148747374143).

1636221115441 is a wasteful number, since it uses less digits than its factorization.

1636221115441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148747374142.

The product of its digits is 34560, while the sum is 37.

The spelling of 1636221115441 in words is "one trillion, six hundred thirty-six billion, two hundred twenty-one million, one hundred fifteen thousand, four hundred forty-one".