1556117001007 has 4 divisors (see below), whose sum is σ = 1556156355336. Its totient is φ = 1556077646680.

The previous prime is 1556117001001. The next prime is 1556117001073. The reversal of 1556117001007 is 7001007116551.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1556117001007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1556117001001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19617793 + ... + 19696954.

It is an arithmetic number, because the mean of its divisors is an integer number (389039088834).

Almost surely, 2^{1556117001007} is an apocalyptic number.

1556117001007 is a deficient number, since it is larger than the sum of its proper divisors (39354329).

1556117001007 is an equidigital number, since it uses as much as digits as its factorization.

1556117001007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39354328.

The product of its (nonzero) digits is 7350, while the sum is 34.

The spelling of 1556117001007 in words is "one trillion, five hundred fifty-six billion, one hundred seventeen million, one thousand, seven".