1521361505551 has 8 divisors (see below), whose sum is σ = 1550155170960. Its totient is φ = 1492571126592.

The previous prime is 1521361505483. The next prime is 1521361505557. The reversal of 1521361505551 is 1555051631251.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1521361505551 - 2¹¹ = 1521361503503 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 (1521361505557) 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 7 ways as a sum of consecutive naturals, for example, 123171 + ... + 1748683.

It is an arithmetic number, because the mean of its divisors is an integer number (193769396370).

Almost surely, 2^{1521361505551} is an apocalyptic number.

1521361505551 is a deficient number, since it is larger than the sum of its proper divisors (28793665409).

1521361505551 is a wasteful number, since it uses less digits than its factorization.

1521361505551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1643225.

The product of its (nonzero) digits is 112500, while the sum is 40.

The spelling of 1521361505551 in words is "one trillion, five hundred twenty-one billion, three hundred sixty-one million, five hundred five thousand, five hundred fifty-one".