13223735561997 has 6 divisors (see below), whose sum is σ = 19100951367342. Its totient is φ = 8815823707992.

The previous prime is 13223735561977. The next prime is 13223735562067. The reversal of 13223735561997 is 79916553732231.

It is a happy number.

13223735561997 is a `hidden beast` number, since 1 + 3 + 2 + 2 + 3 + 7 + 3 + 5 + 5 + 619 + 9 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8269500954276 + 4954234607721 = 2875674^2 + 2225811^2 .

It is not a de Polignac number, because 13223735561997 - 2³⁵ = 13189375823629 is a prime.

It is a super-2 number, since 2×13223735561997² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13223735561977) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 734651975658 + ... + 734651975675.

It is an arithmetic number, because the mean of its divisors is an integer number (3183491894557).

Almost surely, 2^{13223735561997} is an apocalyptic number.

It is an amenable number.

13223735561997 is a deficient number, since it is larger than the sum of its proper divisors (5877215805345).

13223735561997 is a wasteful number, since it uses less digits than its factorization.

13223735561997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1469303951339 (or 1469303951336 counting only the distinct ones).

The product of its digits is 64297800, while the sum is 63.

The spelling of 13223735561997 in words is "thirteen trillion, two hundred twenty-three billion, seven hundred thirty-five million, five hundred sixty-one thousand, nine hundred ninety-seven".