1225681816658 has 16 divisors (see below), whose sum is σ = 2043816827136. Its totient is φ = 547450935120.

The previous prime is 1225681816637. The next prime is 1225681816669. The reversal of 1225681816658 is 8566181865221.

It is a junction number, because it is equal to n+sod(n) for n = 1225681816597 and 1225681816606.

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, 760347716 + ... + 760349327.

It is an arithmetic number, because the mean of its divisors is an integer number (127738551696).

Almost surely, 2^{1225681816658} is an apocalyptic number.

1225681816658 is a deficient number, since it is larger than the sum of its proper divisors (818135010478).

1225681816658 is a wasteful number, since it uses less digits than its factorization.

1225681816658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1520697089.

The product of its digits is 11059200, while the sum is 59.

The spelling of 1225681816658 in words is "one trillion, two hundred twenty-five billion, six hundred eighty-one million, eight hundred sixteen thousand, six hundred fifty-eight".