597161721661 has 8 divisors (see below), whose sum is σ = 605371289400. Its totient is φ = 588952945152.

The previous prime is 597161721659. The next prime is 597161721677. The reversal of 597161721661 is 166127161795.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 207873076761 + 389288644900 = 455931^2 + 623930^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 597161721661 - 2¹ = 597161721659 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 597161721599 and 597161721608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (597161721601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1411365 + ... + 1785013.

It is an arithmetic number, because the mean of its divisors is an integer number (75671411175).

Almost surely, 2^597161721661 is an apocalyptic number.

It is an amenable number.

597161721661 is a deficient number, since it is larger than the sum of its proper divisors (8209567739).

597161721661 is a wasteful number, since it uses less digits than its factorization.

597161721661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395615.

The product of its digits is 952560, while the sum is 52.

The spelling of 597161721661 in words is "five hundred ninety-seven billion, one hundred sixty-one million, seven hundred twenty-one thousand, six hundred sixty-one".