1225610555361 has 4 divisors (see below), whose sum is σ = 1634147407152. Its totient is φ = 817073703572.

The previous prime is 1225610555291. The next prime is 1225610555363. The reversal of 1225610555361 is 1635550165221.

It is a happy number.

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 1225610555361 - 2⁷ = 1225610555233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1225610555363) 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, 204268425891 + ... + 204268425896.

It is an arithmetic number, because the mean of its divisors is an integer number (408536851788).

Almost surely, 2^{1225610555361} is an apocalyptic number.

It is an amenable number.

1225610555361 is a deficient number, since it is larger than the sum of its proper divisors (408536851791).

1225610555361 is an equidigital number, since it uses as much as digits as its factorization.

1225610555361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408536851790.

The product of its (nonzero) digits is 270000, while the sum is 42.

The spelling of 1225610555361 in words is "one trillion, two hundred twenty-five billion, six hundred ten million, five hundred fifty-five thousand, three hundred sixty-one".