181027681650 has 120 divisors (see below), whose sum is σ = 520333543620. Its totient is φ = 46609395840.

The previous prime is 181027681633. The next prime is 181027681651. The reversal of 181027681650 is 56186720181.

It can be written as a sum of positive squares in 6 ways, for example, as 22804322121 + 158223359529 = 151011^2 + 397773^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 181027681596 and 181027681605.

It is not an unprimeable number, because it can be changed into a prime (181027681651) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 653209 + ... + 888108.

Almost surely, 2^181027681650 is an apocalyptic number.

181027681650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181027681650 is an abundant number, since it is smaller than the sum of its proper divisors (339305861970).

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

181027681650 is a wasteful number, since it uses less digits than its factorization.

181027681650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1541370 (or 1541356 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 181027681650 in words is "one hundred eighty-one billion, twenty-seven million, six hundred eighty-one thousand, six hundred fifty".