99646951989 has 16 divisors (see below), whose sum is σ = 143330812352. Its totient is φ = 61214911488.

The previous prime is 99646951967. The next prime is 99646951991. The reversal of 99646951989 is 98915964699.

It is not a de Polignac number, because 99646951989 - 2¹³ = 99646943797 is a prime.

It is a super-2 number, since 2×99646951989² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 99646951989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99646951909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2191579 + ... + 2236584.

It is an arithmetic number, because the mean of its divisors is an integer number (8958175772).

Almost surely, 2^99646951989 is an apocalyptic number.

It is an amenable number.

99646951989 is a deficient number, since it is larger than the sum of its proper divisors (43683860363).

99646951989 is a wasteful number, since it uses less digits than its factorization.

99646951989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4428756.

The product of its digits is 340122240, while the sum is 75.

The spelling of 99646951989 in words is "ninety-nine billion, six hundred forty-six million, nine hundred fifty-one thousand, nine hundred eighty-nine".