1225559402866 has 32 divisors (see below), whose sum is σ = 1947368890368. Its totient is φ = 577551960720.

The previous prime is 1225559402863. The next prime is 1225559402917. The reversal of 1225559402866 is 6682049555221.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1225559402863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 262711 + ... + 1587493.

It is an arithmetic number, because the mean of its divisors is an integer number (60855277824).

Almost surely, 2^{1225559402866} is an apocalyptic number.

1225559402866 is a deficient number, since it is larger than the sum of its proper divisors (721809487502).

1225559402866 is a wasteful number, since it uses less digits than its factorization.

1225559402866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1325206.

The product of its (nonzero) digits is 10368000, while the sum is 55.

The spelling of 1225559402866 in words is "one trillion, two hundred twenty-five billion, five hundred fifty-nine million, four hundred two thousand, eight hundred sixty-six".