161266020045 has 96 divisors (see below), whose sum is σ = 286119475200. Its totient is φ = 77505442560.

The previous prime is 161266020043. The next prime is 161266020077. The reversal of 161266020045 is 540020662161.

It is not a de Polignac number, because 161266020045 - 2¹ = 161266020043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161266019988 and 161266020015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161266020043) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 18534106 + ... + 18542804.

It is an arithmetic number, because the mean of its divisors is an integer number (2980411200).

Almost surely, 2^161266020045 is an apocalyptic number.

161266020045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161266020045 is a deficient number, since it is larger than the sum of its proper divisors (124853455155).

161266020045 is a wasteful number, since it uses less digits than its factorization.

161266020045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8907 (or 8894 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The spelling of 161266020045 in words is "one hundred sixty-one billion, two hundred sixty-six million, twenty thousand, forty-five".