1555122551201 has 4 divisors (see below), whose sum is σ = 1555127024304. Its totient is φ = 1555118078100.

The previous prime is 1555122551173. The next prime is 1555122551219. The reversal of 1555122551201 is 1021552215551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1555122551201 is a prime.

It is a super-2 number, since 2×1555122551201² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1555122551401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1666655 + ... + 2426516.

It is an arithmetic number, because the mean of its divisors is an integer number (388781756076).

Almost surely, 2^{1555122551201} is an apocalyptic number.

It is an amenable number.

1555122551201 is a deficient number, since it is larger than the sum of its proper divisors (4473103).

1555122551201 is an equidigital number, since it uses as much as digits as its factorization.

1555122551201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4473102.

The product of its (nonzero) digits is 25000, while the sum is 35.

Adding to 1555122551201 its reverse (1021552215551), we get a palindrome (2576674766752).

The spelling of 1555122551201 in words is "one trillion, five hundred fifty-five billion, one hundred twenty-two million, five hundred fifty-one thousand, two hundred one".