99640140550 has 24 divisors (see below), whose sum is σ = 186035365296. Its totient is φ = 39704507040.

The previous prime is 99640140497. The next prime is 99640140557. The reversal of 99640140550 is 5504104699.

It is a junction number, because it is equal to n+sod(n) for n = 99640140497 and 99640140506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99640140557) 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 11 ways as a sum of consecutive naturals, for example, 3775449 + ... + 3801748.

It is an arithmetic number, because the mean of its divisors is an integer number (7751473554).

Almost surely, 2^99640140550 is an apocalyptic number.

99640140550 is a deficient number, since it is larger than the sum of its proper divisors (86395224746).

99640140550 is a wasteful number, since it uses less digits than its factorization.

99640140550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7577472 (or 7577467 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 99640140550 in words is "ninety-nine billion, six hundred forty million, one hundred forty thousand, five hundred fifty".