623520331161 has 16 divisors (see below), whose sum is σ = 1023212851584. Its totient is φ = 328889844864.

The previous prime is 623520331157. The next prime is 623520331171. The reversal of 623520331161 is 161133025326.

It is not a de Polignac number, because 623520331161 - 2² = 623520331157 is a prime.

It is a super-2 number, since 2×623520331161² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (623520331171) 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 15 ways as a sum of consecutive naturals, for example, 1141978356 + ... + 1141978901.

It is an arithmetic number, because the mean of its divisors is an integer number (63950803224).

Almost surely, 2^623520331161 is an apocalyptic number.

It is an amenable number.

623520331161 is a deficient number, since it is larger than the sum of its proper divisors (399692520423).

623520331161 is a wasteful number, since it uses less digits than its factorization.

623520331161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2283957280.

The product of its (nonzero) digits is 19440, while the sum is 33.

Adding to 623520331161 its reverse (161133025326), we get a palindrome (784653356487).

The spelling of 623520331161 in words is "six hundred twenty-three billion, five hundred twenty million, three hundred thirty-one thousand, one hundred sixty-one".