691560223201 has 9 divisors (see below), whose sum is σ = 693268378201. Its totient is φ = 689856272752.

The previous prime is 691560223171. The next prime is 691560223219. The reversal of 691560223201 is 102322065196.

The square root of 691560223201 is 831601.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 2793016801 + 688767206400 = 52849^2 + 829920^2 .

It is not a de Polignac number, because 691560223201 - 2¹³ = 691560215009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (691560223231) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 463201011 + ... + 463202503.

Almost surely, 2^691560223201 is an apocalyptic number.

691560223201 is the 831601-st square number.

691560223201 is the 415801-st centered octagonal number.

It is an amenable number.

691560223201 is a deficient number, since it is larger than the sum of its proper divisors (1708155000).

691560223201 is an frugal number, since it uses more digits than its factorization.

691560223201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4100 (or 2050 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

Adding to 691560223201 its reverse (102322065196), we get a palindrome (793882288397).

The spelling of 691560223201 in words is "six hundred ninety-one billion, five hundred sixty million, two hundred twenty-three thousand, two hundred one".