180746737021 has 4 divisors (see below), whose sum is σ = 190259723200. Its totient is φ = 171233750844.

The previous prime is 180746736913. The next prime is 180746737081. The reversal of 180746737021 is 120737647081.

180746737021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 180746737021 - 2⁷ = 180746736893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180746737081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4756493061 + ... + 4756493098.

It is an arithmetic number, because the mean of its divisors is an integer number (47564930800).

Almost surely, 2^180746737021 is an apocalyptic number.

It is an amenable number.

180746737021 is a deficient number, since it is larger than the sum of its proper divisors (9512986179).

180746737021 is an equidigital number, since it uses as much as digits as its factorization.

180746737021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9512986178.

The product of its (nonzero) digits is 395136, while the sum is 46.

The spelling of 180746737021 in words is "one hundred eighty billion, seven hundred forty-six million, seven hundred thirty-seven thousand, twenty-one".