99905477855 has 96 divisors (see below), whose sum is σ = 138141158400. Its totient is φ = 69121492992.

The previous prime is 99905477809. The next prime is 99905477873. The reversal of 99905477855 is 55877450999.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-99905477855 is a prime.

It is a super-2 number, since 2×99905477855² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

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, 179363237 + ... + 179363793.

It is an arithmetic number, because the mean of its divisors is an integer number (1438970400).

Almost surely, 2^99905477855 is an apocalyptic number.

99905477855 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

99905477855 is the 258077-th pentagonal number.

99905477855 is a deficient number, since it is larger than the sum of its proper divisors (38235680545).

99905477855 is a wasteful number, since it uses less digits than its factorization.

99905477855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801 (or 784 counting only the distinct ones).

The product of its (nonzero) digits is 142884000, while the sum is 68.

It can be divided in two parts, 9990 and 5477855, that added together give a palindrome (5487845).

The spelling of 99905477855 in words is "ninety-nine billion, nine hundred five million, four hundred seventy-seven thousand, eight hundred fifty-five".