161266020113 has 4 divisors (see below), whose sum is σ = 175926567408. Its totient is φ = 146605472820.

The previous prime is 161266020077. The next prime is 161266020121. The reversal of 161266020113 is 311020662161.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 161266020113 - 2¹² = 161266016017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161266020413) 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, 7330273631 + ... + 7330273652.

It is an arithmetic number, because the mean of its divisors is an integer number (43981641852).

Almost surely, 2^161266020113 is an apocalyptic number.

It is an amenable number.

161266020113 is a deficient number, since it is larger than the sum of its proper divisors (14660547295).

161266020113 is a wasteful number, since it uses less digits than its factorization.

161266020113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14660547294.

The product of its (nonzero) digits is 2592, while the sum is 29.

Adding to 161266020113 its reverse (311020662161), we get a palindrome (472286682274).

The spelling of 161266020113 in words is "one hundred sixty-one billion, two hundred sixty-six million, twenty thousand, one hundred thirteen".