99906191523840 has 2048 divisors, whose sum is σ = 379417023659520. Its totient is φ = 22221623918592.

The previous prime is 99906191523833. The next prime is 99906191523863. The reversal of 99906191523840 is 4832519160999.

It is a tau number, because it is divible by the number of its divisors (2048).

It is a super-2 number, since 2×99906191523840² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 340976762734 + ... + 340976763026.

Almost surely, 2^{99906191523840} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99906191523840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189708511829760).

99906191523840 is an abundant number, since it is smaller than the sum of its proper divisors (279510832135680).

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

99906191523840 is a wasteful number, since it uses less digits than its factorization.

99906191523840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477 (or 449 counting only the distinct ones).

The product of its (nonzero) digits is 37791360, while the sum is 66.

The spelling of 99906191523840 in words is "ninety-nine trillion, nine hundred six billion, one hundred ninety-one million, five hundred twenty-three thousand, eight hundred forty".