2563905381 has 8 divisors (see below), whose sum is σ = 3567172800. Its totient is φ = 1634954112.

The previous prime is 2563905373. The next prime is 2563905433. The reversal of 2563905381 is 1835093652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2563905381 - 2³ = 2563905373 is a prime.

It is a super-2 number, since 2×2563905381² = 13147221605441510322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2563905481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18578956 + ... + 18579093.

It is an arithmetic number, because the mean of its divisors is an integer number (445896600).

Almost surely, 2^2563905381 is an apocalyptic number.

It is an amenable number.

2563905381 is a deficient number, since it is larger than the sum of its proper divisors (1003267419).

2563905381 is a wasteful number, since it uses less digits than its factorization.

2563905381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37158075.

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 2563905381 is about 50635.0212896173. The cubic root of 2563905381 is about 1368.6760401062.

The spelling of 2563905381 in words is "two billion, five hundred sixty-three million, nine hundred five thousand, three hundred eighty-one".