1225205365556 has 24 divisors (see below), whose sum is σ = 2257059211680. Its totient is φ = 580334218272.

The previous prime is 1225205365513. The next prime is 1225205365619. The reversal of 1225205365556 is 6555635025221.

It is a happy number.

It is a super-2 number, since 2×1225205365556² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1225205365556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1384115 + ... + 2089541.

It is an arithmetic number, because the mean of its divisors is an integer number (94044133820).

Almost surely, 2^{1225205365556} is an apocalyptic number.

It is an amenable number.

1225205365556 is a deficient number, since it is larger than the sum of its proper divisors (1031853846124).

1225205365556 is a wasteful number, since it uses less digits than its factorization.

1225205365556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728303 (or 728301 counting only the distinct ones).

The product of its (nonzero) digits is 2700000, while the sum is 47.

The spelling of 1225205365556 in words is "one trillion, two hundred twenty-five billion, two hundred five million, three hundred sixty-five thousand, five hundred fifty-six".