161311164502 has 4 divisors (see below), whose sum is σ = 241966746756. Its totient is φ = 80655582250.

The previous prime is 161311164461. The next prime is 161311164503. The reversal of 161311164502 is 205461113161.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161311164503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40327791124 + ... + 40327791127.

It is an arithmetic number, because the mean of its divisors is an integer number (60491686689).

Almost surely, 2^161311164502 is an apocalyptic number.

161311164502 is a deficient number, since it is larger than the sum of its proper divisors (80655582254).

161311164502 is an equidigital number, since it uses as much as digits as its factorization.

161311164502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80655582253.

The product of its (nonzero) digits is 4320, while the sum is 31.

Adding to 161311164502 its reverse (205461113161), we get a palindrome (366772277663).

The spelling of 161311164502 in words is "one hundred sixty-one billion, three hundred eleven million, one hundred sixty-four thousand, five hundred two".