146322640721 has 4 divisors (see below), whose sum is σ = 146323457700. Its totient is φ = 146321823744.

The previous prime is 146322640697. The next prime is 146322640733. The reversal of 146322640721 is 127046223641.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 120225853696 + 26096787025 = 346736^2 + 161545^2 .

It is a cyclic number.

It is not a de Polignac number, because 146322640721 - 2¹⁸ = 146322378577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (146322640021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10736 + ... + 541073.

It is an arithmetic number, because the mean of its divisors is an integer number (36580864425).

Almost surely, 2^146322640721 is an apocalyptic number.

It is an amenable number.

146322640721 is a deficient number, since it is larger than the sum of its proper divisors (816979).

146322640721 is an equidigital number, since it uses as much as digits as its factorization.

146322640721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816978.

The product of its (nonzero) digits is 96768, while the sum is 38.

The spelling of 146322640721 in words is "one hundred forty-six billion, three hundred twenty-two million, six hundred forty thousand, seven hundred twenty-one".