180690081525 has 36 divisors (see below), whose sum is σ = 342673432452. Its totient is φ = 90699333120.

The previous prime is 180690081521. The next prime is 180690081547. The reversal of 180690081525 is 525180096081.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 25979409 + 180664102116 = 5097^2 + 425046^2 .

It is not a de Polignac number, because 180690081525 - 2² = 180690081521 is a prime.

It is a super-2 number, since 2×180690081525² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180690081521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 23615794 + ... + 23623443.

It is an arithmetic number, because the mean of its divisors is an integer number (9518706457).

Almost surely, 2^180690081525 is an apocalyptic number.

180690081525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

180690081525 is a deficient number, since it is larger than the sum of its proper divisors (161983350927).

180690081525 is a wasteful number, since it uses less digits than its factorization.

180690081525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47239270 (or 47239262 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 45.

The spelling of 180690081525 in words is "one hundred eighty billion, six hundred ninety million, eighty-one thousand, five hundred twenty-five".