1287551501553 has 16 divisors (see below), whose sum is σ = 1756861839360. Its totient is φ = 838379420496.

The previous prime is 1287551501527. The next prime is 1287551501581. The reversal of 1287551501553 is 3551051557821.

It is not a de Polignac number, because 1287551501553 - 2¹² = 1287551497457 is a prime.

It is a super-2 number, since 2×1287551501553² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1287551501503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9306663 + ... + 9443996.

It is an arithmetic number, because the mean of its divisors is an integer number (109803864960).

Almost surely, 2^{1287551501553} is an apocalyptic number.

It is an amenable number.

1287551501553 is a deficient number, since it is larger than the sum of its proper divisors (469310337807).

1287551501553 is a wasteful number, since it uses less digits than its factorization.

1287551501553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18751196.

The product of its (nonzero) digits is 1050000, while the sum is 48.

The spelling of 1287551501553 in words is "one trillion, two hundred eighty-seven billion, five hundred fifty-one million, five hundred one thousand, five hundred fifty-three".