123257585821 has 16 divisors (see below), whose sum is σ = 135088228800. Its totient is φ = 112054665600.

The previous prime is 123257585809. The next prime is 123257585827. The reversal of 123257585821 is 128585752321.

It is a cyclic number.

It is not a de Polignac number, because 123257585821 - 2¹³ = 123257577629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123257585827) 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, 1249411 + ... + 1344448.

It is an arithmetic number, because the mean of its divisors is an integer number (8443014300).

Almost surely, 2^123257585821 is an apocalyptic number.

It is an amenable number.

123257585821 is a deficient number, since it is larger than the sum of its proper divisors (11830642979).

123257585821 is a wasteful number, since it uses less digits than its factorization.

123257585821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2593980.

The product of its digits is 1344000, while the sum is 49.

The spelling of 123257585821 in words is "one hundred twenty-three billion, two hundred fifty-seven million, five hundred eighty-five thousand, eight hundred twenty-one".