161573464439 has 4 divisors (see below), whose sum is σ = 161842306080. Its totient is φ = 161304622800.

The previous prime is 161573464427. The next prime is 161573464483. The reversal of 161573464439 is 934464375161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 934464375161 = 223 ⋅4190423207.

It is a cyclic number.

It is not a de Polignac number, because 161573464439 - 2⁸ = 161573464183 is a prime.

It is a super-2 number, since 2×161573464439² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161573464499) 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, 134419919 + ... + 134421120.

It is an arithmetic number, because the mean of its divisors is an integer number (40460576520).

Almost surely, 2^161573464439 is an apocalyptic number.

161573464439 is a deficient number, since it is larger than the sum of its proper divisors (268841641).

161573464439 is an equidigital number, since it uses as much as digits as its factorization.

161573464439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268841640.

The product of its digits is 6531840, while the sum is 53.

The spelling of 161573464439 in words is "one hundred sixty-one billion, five hundred seventy-three million, four hundred sixty-four thousand, four hundred thirty-nine".