161445113507 has 2 divisors, whose sum is σ = 161445113508. Its totient is φ = 161445113506.

The previous prime is 161445113429. The next prime is 161445113519. The reversal of 161445113507 is 705311544161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161445113507 - 2⁸ = 161445113251 is a prime.

It is a super-2 number, since 2×161445113507² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161445113527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80722556753 + 80722556754.

It is an arithmetic number, because the mean of its divisors is an integer number (80722556754).

Almost surely, 2^161445113507 is an apocalyptic number.

161445113507 is a deficient number, since it is larger than the sum of its proper divisors (1).

161445113507 is an equidigital number, since it uses as much as digits as its factorization.

161445113507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50400, while the sum is 38.

Adding to 161445113507 its reverse (705311544161), we get a palindrome (866756657668).

The spelling of 161445113507 in words is "one hundred sixty-one billion, four hundred forty-five million, one hundred thirteen thousand, five hundred seven".