161848927397 has 4 divisors (see below), whose sum is σ = 171369452556. Its totient is φ = 152328402240.

The previous prime is 161848927379. The next prime is 161848927403. The reversal of 161848927397 is 793729848161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 793729848161 = 4861 ⋅163285301.

It can be written as a sum of positive squares in 2 ways, for example, as 48932094436 + 112916832961 = 221206^2 + 336031^2 .

It is a cyclic number.

It is not a de Polignac number, because 161848927397 - 2¹⁴ = 161848911013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161848927997) 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, 4760262554 + ... + 4760262587.

It is an arithmetic number, because the mean of its divisors is an integer number (42842363139).

Almost surely, 2^161848927397 is an apocalyptic number.

161848927397 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

161848927397 is a deficient number, since it is larger than the sum of its proper divisors (9520525159).

161848927397 is an equidigital number, since it uses as much as digits as its factorization.

161848927397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9520525158.

The product of its digits is 36578304, while the sum is 65.

The spelling of 161848927397 in words is "one hundred sixty-one billion, eight hundred forty-eight million, nine hundred twenty-seven thousand, three hundred ninety-seven".