1636221115440 has 120 divisors (see below), whose sum is σ = 5543604293760. Its totient is φ = 432464320512.

The previous prime is 1636221115439. The next prime is 1636221115457. The reversal of 1636221115440 is 445111226361.

1636221115440 is a `hidden beast` number, since 1 + 6 + 3 + 622 + 11 + 15 + 4 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×1636221115440² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1636221115395 and 1636221115404.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9974080 + ... + 10136799.

It is an arithmetic number, because the mean of its divisors is an integer number (46196702448).

Almost surely, 2^{1636221115440} is an apocalyptic number.

1636221115440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1636221115440 is an abundant number, since it is smaller than the sum of its proper divisors (3907383178320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1636221115440 is a wasteful number, since it uses less digits than its factorization.

1636221115440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20111011 (or 20111002 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 1636221115440 in words is "one trillion, six hundred thirty-six billion, two hundred twenty-one million, one hundred fifteen thousand, four hundred forty".