1521550056455 has 48 divisors (see below), whose sum is σ = 2173393283040. Its totient is φ = 1015752756480.

The previous prime is 1521550056451. The next prime is 1521550056493. The reversal of 1521550056455 is 5546500551251.

It is a happy number.

It is not a de Polignac number, because 1521550056455 - 2² = 1521550056451 is a prime.

It is a super-2 number, since 2×1521550056455² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521550056451) 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 47 ways as a sum of consecutive naturals, for example, 867449 + ... + 1948221.

It is an arithmetic number, because the mean of its divisors is an integer number (45279026730).

Almost surely, 2^{1521550056455} is an apocalyptic number.

1521550056455 is a deficient number, since it is larger than the sum of its proper divisors (651843226585).

1521550056455 is a wasteful number, since it uses less digits than its factorization.

1521550056455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080992 (or 1080981 counting only the distinct ones).

The product of its (nonzero) digits is 750000, while the sum is 44.

The spelling of 1521550056455 in words is "one trillion, five hundred twenty-one billion, five hundred fifty million, fifty-six thousand, four hundred fifty-five".