99187968501 has 40 divisors (see below), whose sum is σ = 148673477304. Its totient is φ = 65900926080.

The previous prime is 99187968499. The next prime is 99187968521. The reversal of 99187968501 is 10586978199.

It can be written as a sum of positive squares in 4 ways, for example, as 1178274276 + 98009694225 = 34326^2 + 313065^2 .

It is not a de Polignac number, because 99187968501 - 2¹ = 99187968499 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99187968521) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 34960855 + ... + 34963691.

Almost surely, 2^99187968501 is an apocalyptic number.

It is an amenable number.

99187968501 is a deficient number, since it is larger than the sum of its proper divisors (49485508803).

99187968501 is a wasteful number, since it uses less digits than its factorization.

99187968501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4163 (or 4154 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 63.

The spelling of 99187968501 in words is "ninety-nine billion, one hundred eighty-seven million, nine hundred sixty-eight thousand, five hundred one".