15985184955 has 16 divisors (see below), whose sum is σ = 25598315520. Its totient is φ = 8518092128.

The previous prime is 15985184953. The next prime is 15985185019. The reversal of 15985184955 is 55948158951.

It is a cyclic number.

It is not a de Polignac number, because 15985184955 - 2¹ = 15985184953 is a prime.

It is a super-2 number, since 2×15985184955² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15985184953) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 440715 + ... + 475604.

It is an arithmetic number, because the mean of its divisors is an integer number (1599894720).

Almost surely, 2^15985184955 is an apocalyptic number.

15985184955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15985184955 is a deficient number, since it is larger than the sum of its proper divisors (9613130565).

15985184955 is a wasteful number, since it uses less digits than its factorization.

15985184955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917490.

The product of its digits is 12960000, while the sum is 60.

The spelling of 15985184955 in words is "fifteen billion, nine hundred eighty-five million, one hundred eighty-four thousand, nine hundred fifty-five".