521378873125 has 40 divisors (see below), whose sum is σ = 711006180192. Its totient is φ = 379044600000.

The previous prime is 521378873083. The next prime is 521378873129.

521378873125 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 521378873125 - 2²⁷ = 521244655397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521378873129) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 20866890 + ... + 20891860.

Almost surely, 2^521378873125 is an apocalyptic number.

521378873125 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

521378873125 is a deficient number, since it is larger than the sum of its proper divisors (189627307067).

521378873125 is a wasteful number, since it uses less digits than its factorization.

521378873125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28039 (or 28024 counting only the distinct ones).

The product of its digits is 2822400, while the sum is 52.

The spelling of 521378873125 in words is "five hundred twenty-one billion, three hundred seventy-eight million, eight hundred seventy-three thousand, one hundred twenty-five".