404857725981 has 4 divisors (see below), whose sum is σ = 539810301312. Its totient is φ = 269905150652.

The previous prime is 404857725959. The next prime is 404857725983. The reversal of 404857725981 is 189527758404.

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 404857725981 - 2³³ = 396267791389 is a prime.

It is a super-2 number, since 2×404857725981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404857725983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67476287661 + ... + 67476287666.

It is an arithmetic number, because the mean of its divisors is an integer number (134952575328).

Almost surely, 2^404857725981 is an apocalyptic number.

It is an amenable number.

404857725981 is a deficient number, since it is larger than the sum of its proper divisors (134952575331).

404857725981 is a wasteful number, since it uses less digits than its factorization.

404857725981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134952575330.

The product of its (nonzero) digits is 22579200, while the sum is 60.

The spelling of 404857725981 in words is "four hundred four billion, eight hundred fifty-seven million, seven hundred twenty-five thousand, nine hundred eighty-one".