8223012025561 has 6 divisors (see below), whose sum is σ = 8364747369962. Its totient is φ = 8083638936960.

The previous prime is 8223012025511. The next prime is 8223012025567. The reversal of 8223012025561 is 1655202103228.

It can be written as a sum of positive squares in only one way, i.e., 4201106115600 + 4021905909961 = 2049660^2 + 2005469^2 .

It is not a de Polignac number, because 8223012025561 - 2²⁵ = 8222978471129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8223012025561.

It is not an unprimeable number, because it can be changed into a prime (8223012025567) 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, 1181124360 + ... + 1181131321.

Almost surely, 2^{8223012025561} is an apocalyptic number.

It is an amenable number.

8223012025561 is a deficient number, since it is larger than the sum of its proper divisors (141735344401).

8223012025561 is an equidigital number, since it uses as much as digits as its factorization.

8223012025561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2362255799 (or 2362255740 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

Adding to 8223012025561 its reverse (1655202103228), we get a palindrome (9878214128789).

The spelling of 8223012025561 in words is "eight trillion, two hundred twenty-three billion, twelve million, twenty-five thousand, five hundred sixty-one".