258456661587 has 24 divisors (see below), whose sum is σ = 375233230944. Its totient is φ = 171426021504.

The previous prime is 258456661543. The next prime is 258456661607. The reversal of 258456661587 is 785166654852.

It is not a de Polignac number, because 258456661587 - 2¹² = 258456657491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (258456661487) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1759063 + ... + 1900319.

It is an arithmetic number, because the mean of its divisors is an integer number (15634717956).

Almost surely, 2^258456661587 is an apocalyptic number.

258456661587 is a deficient number, since it is larger than the sum of its proper divisors (116776569357).

258456661587 is a wasteful number, since it uses less digits than its factorization.

258456661587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142299 (or 142296 counting only the distinct ones).

The product of its digits is 96768000, while the sum is 63.

The spelling of 258456661587 in words is "two hundred fifty-eight billion, four hundred fifty-six million, six hundred sixty-one thousand, five hundred eighty-seven".