99999999540 has 144 divisors (see below), whose sum is σ = 346750080768. Its totient is φ = 22851643392.

The previous prime is 99999999529. The next prime is 99999999551. The reversal of 99999999540 is 4599999999.

It is an interprime number because it is at equal distance from previous prime (99999999529) and next prime (99999999551).

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 99999999540.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7695889 + ... + 7708871.

It is an arithmetic number, because the mean of its divisors is an integer number (2407986672).

Almost surely, 2^99999999540 is an apocalyptic number.

99999999540 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

99999999540 is an abundant number, since it is smaller than the sum of its proper divisors (246750081228).

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

99999999540 is a wasteful number, since it uses less digits than its factorization.

99999999540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19118 (or 19113 counting only the distinct ones).

The product of its (nonzero) digits is 860934420, while the sum is 81.

The spelling of 99999999540 in words is "ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, five hundred forty".