1287082538657 has 4 divisors (see below), whose sum is σ = 1296907596336. Its totient is φ = 1277257480980.

The previous prime is 1287082538633. The next prime is 1287082538663. The reversal of 1287082538657 is 7568352807821.

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 not a de Polignac number, because 1287082538657 - 2¹⁰ = 1287082537633 is a prime.

It is a super-2 number, since 2×1287082538657² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1287082538657.

It is not an unprimeable number, because it can be changed into a prime (1287082538627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4912528643 + ... + 4912528904.

It is an arithmetic number, because the mean of its divisors is an integer number (324226899084).

Almost surely, 2^{1287082538657} is an apocalyptic number.

It is an amenable number.

1287082538657 is a deficient number, since it is larger than the sum of its proper divisors (9825057679).

1287082538657 is an equidigital number, since it uses as much as digits as its factorization.

1287082538657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9825057678.

The product of its (nonzero) digits is 45158400, while the sum is 62.

The spelling of 1287082538657 in words is "one trillion, two hundred eighty-seven billion, eighty-two million, five hundred thirty-eight thousand, six hundred fifty-seven".