99645023556 has 405 divisors, whose sum is σ = 301950163053. Its totient is φ = 28637219520.

The previous prime is 99645023509. The next prime is 99645023557. The reversal of 99645023556 is 65532054699.

It is a happy number.

The square root of 99645023556 is 315666.

It is a perfect power (a square), and thus also a powerful number.

99645023556 is a `hidden beast` number, since 9 + 9 + 64 + 5 + 0 + 23 + 556 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14740388100 + 84904635456 = 121410^2 + 291384^2 .

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

It is not an unprimeable number, because it can be changed into a prime (99645023557) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 1403451001 + ... + 1403451071.

Almost surely, 2^99645023556 is an apocalyptic number.

99645023556 is the 315666-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99645023556

99645023556 is an abundant number, since it is smaller than the sum of its proper divisors (202305139497).

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

99645023556 is a wasteful number, since it uses less digits than its factorization.

99645023556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 108 counting only the distinct ones).

The product of its (nonzero) digits is 8748000, while the sum is 54.

The spelling of 99645023556 in words is "ninety-nine billion, six hundred forty-five million, twenty-three thousand, five hundred fifty-six".