1687505242461 has 4 divisors (see below), whose sum is σ = 2250006989952. Its totient is φ = 1125003494972.

The previous prime is 1687505242417. The next prime is 1687505242499. The reversal of 1687505242461 is 1642425057861.

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 1687505242461 - 2¹³ = 1687505234269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1687505246461) 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, 281250873741 + ... + 281250873746.

It is an arithmetic number, because the mean of its divisors is an integer number (562501747488).

Almost surely, 2^{1687505242461} is an apocalyptic number.

It is an amenable number.

1687505242461 is a deficient number, since it is larger than the sum of its proper divisors (562501747491).

1687505242461 is an equidigital number, since it uses as much as digits as its factorization.

1687505242461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562501747490.

The product of its (nonzero) digits is 3225600, while the sum is 51.

The spelling of 1687505242461 in words is "one trillion, six hundred eighty-seven billion, five hundred five million, two hundred forty-two thousand, four hundred sixty-one".