161355620597 has 4 divisors (see below), whose sum is σ = 161358818016. Its totient is φ = 161352423180.

The previous prime is 161355620579. The next prime is 161355620611. The reversal of 161355620597 is 795026553161.

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.

It is a cyclic number.

It is not a de Polignac number, because 161355620597 - 2⁶ = 161355620533 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 (161355620537) 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, 1521779 + ... + 1624352.

It is an arithmetic number, because the mean of its divisors is an integer number (40339704504).

Almost surely, 2^161355620597 is an apocalyptic number.

It is an amenable number.

161355620597 is a deficient number, since it is larger than the sum of its proper divisors (3197419).

161355620597 is an equidigital number, since it uses as much as digits as its factorization.

161355620597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3197418.

The product of its (nonzero) digits is 1701000, while the sum is 50.

The spelling of 161355620597 in words is "one hundred sixty-one billion, three hundred fifty-five million, six hundred twenty thousand, five hundred ninety-seven".