161502040397 has 4 divisors (see below), whose sum is σ = 161770763196. Its totient is φ = 161233317600.

The previous prime is 161502040369. The next prime is 161502040417. The reversal of 161502040397 is 793040205161.

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 132704289796 + 28797750601 = 364286^2 + 169699^2 .

It is a cyclic number.

It is not a de Polignac number, because 161502040397 - 2¹² = 161502036301 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161502040397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161502040097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134360498 + ... + 134361699.

It is an arithmetic number, because the mean of its divisors is an integer number (40442690799).

Almost surely, 2^161502040397 is an apocalyptic number.

It is an amenable number.

161502040397 is a deficient number, since it is larger than the sum of its proper divisors (268722799).

161502040397 is an equidigital number, since it uses as much as digits as its factorization.

161502040397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268722798.

The product of its (nonzero) digits is 45360, while the sum is 38.

The spelling of 161502040397 in words is "one hundred sixty-one billion, five hundred two million, forty thousand, three hundred ninety-seven".