99180917640 has 384 divisors, whose sum is σ = 396991411200. Its totient is φ = 21938273280.

The previous prime is 99180917603. The next prime is 99180917683. The reversal of 99180917640 is 4671908199.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1610292 + ... + 1670748.

It is an arithmetic number, because the mean of its divisors is an integer number (1033831800).

Almost surely, 2^99180917640 is an apocalyptic number.

99180917640 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99180917640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198495705600).

99180917640 is an abundant number, since it is smaller than the sum of its proper divisors (297810493560).

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

99180917640 is a wasteful number, since it uses less digits than its factorization.

99180917640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60522 (or 60505 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 54.

The spelling of 99180917640 in words is "ninety-nine billion, one hundred eighty million, nine hundred seventeen thousand, six hundred forty".