161572069889 has 4 divisors (see below), whose sum is σ = 161572919856. Its totient is φ = 161571219924.

The previous prime is 161572069861. The next prime is 161572069903. The reversal of 161572069889 is 988960275161.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 161572069889 - 2¹⁶ = 161572004353 is a prime.

It is a super-2 number, since 2×161572069889² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161572069819) 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, 5522 + ... + 568484.

It is an arithmetic number, because the mean of its divisors is an integer number (40393229964).

Almost surely, 2^161572069889 is an apocalyptic number.

It is an amenable number.

161572069889 is a deficient number, since it is larger than the sum of its proper divisors (849967).

161572069889 is an equidigital number, since it uses as much as digits as its factorization.

161572069889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849966.

The product of its (nonzero) digits is 13063680, while the sum is 62.

The spelling of 161572069889 in words is "one hundred sixty-one billion, five hundred seventy-two million, sixty-nine thousand, eight hundred eighty-nine".