1217155505607 has 32 divisors (see below), whose sum is σ = 1848217512960. Its totient is φ = 791359489440.

The previous prime is 1217155505603. The next prime is 1217155505641. The reversal of 1217155505607 is 7065055517121.

1217155505607 is a `hidden beast` number, since 1 + 21 + 7 + 15 + 5 + 5 + 0 + 5 + 607 = 666.

It is not a de Polignac number, because 1217155505607 - 2² = 1217155505603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217155505603) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2307619 + ... + 2785572.

It is an arithmetic number, because the mean of its divisors is an integer number (57756797280).

Almost surely, 2^{1217155505607} is an apocalyptic number.

1217155505607 is a deficient number, since it is larger than the sum of its proper divisors (631062007353).

1217155505607 is a wasteful number, since it uses less digits than its factorization.

1217155505607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5093420 (or 5093414 counting only the distinct ones).

The product of its (nonzero) digits is 367500, while the sum is 45.

The spelling of 1217155505607 in words is "one trillion, two hundred seventeen billion, one hundred fifty-five million, five hundred five thousand, six hundred seven".