7644661135554 has 16 divisors (see below), whose sum is σ = 15356676116448. Its totient is φ = 2536994737632.

The previous prime is 7644661135471. The next prime is 7644661135583. The reversal of 7644661135554 is 4555311664467.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 7644661135494 and 7644661135503.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2806408747 + ... + 2806411470.

It is an arithmetic number, because the mean of its divisors is an integer number (959792257278).

Almost surely, 2^{7644661135554} is an apocalyptic number.

7644661135554 is an abundant number, since it is smaller than the sum of its proper divisors (7712014980894).

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

7644661135554 is a wasteful number, since it uses less digits than its factorization.

7644661135554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5612820449.

The product of its digits is 36288000, while the sum is 57.

The spelling of 7644661135554 in words is "seven trillion, six hundred forty-four billion, six hundred sixty-one million, one hundred thirty-five thousand, five hundred fifty-four".