38817135521781 has 16 divisors (see below), whose sum is σ = 52032515624256. Its totient is φ = 25739964988416.

The previous prime is 38817135521713. The next prime is 38817135521789. The reversal of 38817135521781 is 18712553171883.

It is not a de Polignac number, because 38817135521781 - 2³⁷ = 38679696568309 is a prime.

It is a super-2 number, since 2×38817135521781² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38817135521789) 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, 1569855 + ... + 8949788.

It is an arithmetic number, because the mean of its divisors is an integer number (3252032226516).

Almost surely, 2^{38817135521781} is an apocalyptic number.

It is an amenable number.

38817135521781 is a deficient number, since it is larger than the sum of its proper divisors (13215380102475).

38817135521781 is a wasteful number, since it uses less digits than its factorization.

38817135521781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10526212.

The product of its digits is 11289600, while the sum is 60.

The spelling of 38817135521781 in words is "thirty-eight trillion, eight hundred seventeen billion, one hundred thirty-five million, five hundred twenty-one thousand, seven hundred eighty-one".