99871566480 has 240 divisors, whose sum is σ = 396534977280. Its totient is φ = 22040589312.

The previous prime is 99871566463. The next prime is 99871566481. The reversal of 99871566480 is 8466517899.

99871566480 is a `hidden beast` number, since 9 + 9 + 87 + 15 + 66 + 480 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

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

It is not an unprimeable number, because it can be changed into a prime (99871566481) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 195492 + ... + 487811.

It is an arithmetic number, because the mean of its divisors is an integer number (1652229072).

Almost surely, 2^99871566480 is an apocalyptic number.

99871566480 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

99871566480 is an abundant number, since it is smaller than the sum of its proper divisors (296663410800).

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

99871566480 is a wasteful number, since it uses less digits than its factorization.

99871566480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683358 (or 683349 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 63.

The spelling of 99871566480 in words is "ninety-nine billion, eight hundred seventy-one million, five hundred sixty-six thousand, four hundred eighty".