99521603765 has 8 divisors (see below), whose sum is σ = 123278373888. Its totient is φ = 77048983440.

The previous prime is 99521603707. The next prime is 99521603767. The reversal of 99521603765 is 56730612599.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 99521603765 - 2⁸ = 99521603509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99521603767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 321037277 + ... + 321037586.

It is an arithmetic number, because the mean of its divisors is an integer number (15409796736).

Almost surely, 2^99521603765 is an apocalyptic number.

It is an amenable number.

99521603765 is a deficient number, since it is larger than the sum of its proper divisors (23756770123).

99521603765 is a wasteful number, since it uses less digits than its factorization.

99521603765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642074899.

The product of its (nonzero) digits is 3061800, while the sum is 53.

The spelling of 99521603765 in words is "ninety-nine billion, five hundred twenty-one million, six hundred three thousand, seven hundred sixty-five".