1551511521345 has 16 divisors (see below), whose sum is σ = 2490890859072. Its totient is φ = 824648669760.

The previous prime is 1551511521247. The next prime is 1551511521437. The reversal of 1551511521345 is 5431251151551.

It is not a de Polignac number, because 1551511521345 - 2⁸ = 1551511521089 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176504311 + ... + 176513100.

It is an arithmetic number, because the mean of its divisors is an integer number (155680678692).

Almost surely, 2^{1551511521345} is an apocalyptic number.

1551511521345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1551511521345 is a deficient number, since it is larger than the sum of its proper divisors (939379337727).

1551511521345 is a wasteful number, since it uses less digits than its factorization.

1551511521345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353017712.

The product of its digits is 75000, while the sum is 39.

Adding to 1551511521345 its reverse (5431251151551), we get a palindrome (6982762672896).

The spelling of 1551511521345 in words is "one trillion, five hundred fifty-one billion, five hundred eleven million, five hundred twenty-one thousand, three hundred forty-five".