161020757254573 has 4 divisors (see below), whose sum is σ = 170492566504860. Its totient is φ = 151548948004288.

The previous prime is 161020757254561. The next prime is 161020757254627. The reversal of 161020757254573 is 375452757020161.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 147935333659689 + 13085423594884 = 12162867^2 + 3617378^2 .

It is a cyclic number.

It is not a de Polignac number, because 161020757254573 - 2²¹ = 161020755157421 is a prime.

It is a super-2 number, since 2×161020757254573² (a number of 29 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 (161020757254673) 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, 4735904625118 + ... + 4735904625151.

It is an arithmetic number, because the mean of its divisors is an integer number (42623141626215).

Almost surely, 2^{161020757254573} is an apocalyptic number.

It is an amenable number.

161020757254573 is a deficient number, since it is larger than the sum of its proper divisors (9471809250287).

161020757254573 is an equidigital number, since it uses as much as digits as its factorization.

161020757254573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9471809250286.

The product of its (nonzero) digits is 12348000, while the sum is 55.

The spelling of 161020757254573 in words is "one hundred sixty-one trillion, twenty billion, seven hundred fifty-seven million, two hundred fifty-four thousand, five hundred seventy-three".