99156778560 has 1680 divisors, whose sum is σ = 449273054208. Its totient is φ = 20304691200.

The previous prime is 99156778549. The next prime is 99156778579. The reversal of 99156778560 is 6587765199.

99156778560 is a `hidden beast` number, since 9 + 9 + 1 + 5 + 67 + 7 + 8 + 560 = 666.

It is a tau number, because it is divible by the number of its divisors (1680).

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 1625520930 + ... + 1625520990.

Almost surely, 2^99156778560 is an apocalyptic number.

99156778560 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 99156778560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224636527104).

99156778560 is an abundant number, since it is smaller than the sum of its proper divisors (350116275648).

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

99156778560 is a wasteful number, since it uses less digits than its factorization.

99156778560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 28576800, while the sum is 63.

The spelling of 99156778560 in words is "ninety-nine billion, one hundred fifty-six million, seven hundred seventy-eight thousand, five hundred sixty".