181762818049 has 16 divisors (see below), whose sum is σ = 192121534800. Its totient is φ = 171695620096.

The previous prime is 181762818031. The next prime is 181762818059. The reversal of 181762818049 is 940818267181.

It can be written as a sum of positive squares in 8 ways, for example, as 3799489600 + 177963328449 = 61640^2 + 421857^2 .

It is a de Polignac number, because none of the positive numbers 2^k-181762818049 is a prime.

It is a super-2 number, since 2×181762818049² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181762818059) 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, 375057 + ... + 710065.

It is an arithmetic number, because the mean of its divisors is an integer number (12007595925).

Almost surely, 2^181762818049 is an apocalyptic number.

It is an amenable number.

181762818049 is a deficient number, since it is larger than the sum of its proper divisors (10358716751).

181762818049 is a wasteful number, since it uses less digits than its factorization.

181762818049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335444.

The product of its (nonzero) digits is 1548288, while the sum is 55.

The spelling of 181762818049 in words is "one hundred eighty-one billion, seven hundred sixty-two million, eight hundred eighteen thousand, forty-nine".