81952553169 has 32 divisors (see below), whose sum is σ = 122113198080. Its totient is φ = 54319449600.

The previous prime is 81952553167. The next prime is 81952553171. The reversal of 81952553169 is 96135525918.

81952553169 is a `hidden beast` number, since 8 + 1 + 9 + 525 + 53 + 1 + 69 = 666.

It is an interprime number because it is at equal distance from previous prime (81952553167) and next prime (81952553171).

It is not a de Polignac number, because 81952553169 - 2¹ = 81952553167 is a prime.

It is a super-2 number, since 2×81952553169² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81952553167) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13699159 + ... + 13705139.

It is an arithmetic number, because the mean of its divisors is an integer number (3816037440).

Almost surely, 2^81952553169 is an apocalyptic number.

It is an amenable number.

81952553169 is a deficient number, since it is larger than the sum of its proper divisors (40160644911).

81952553169 is a wasteful number, since it uses less digits than its factorization.

81952553169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8838 (or 8832 counting only the distinct ones).

The product of its digits is 2916000, while the sum is 54.

The spelling of 81952553169 in words is "eighty-one billion, nine hundred fifty-two million, five hundred fifty-three thousand, one hundred sixty-nine".