38781551743781 has 24 divisors (see below), whose sum is σ = 49214871264384. Its totient is φ = 30219124145280.

The previous prime is 38781551743777. The next prime is 38781551743799. The reversal of 38781551743781 is 18734715518783.

It is not a de Polignac number, because 38781551743781 - 2² = 38781551743777 is a prime.

It is a super-2 number, since 2×38781551743781² (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 (38781551643781) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79260221 + ... + 79748013.

It is an arithmetic number, because the mean of its divisors is an integer number (2050619636016).

Almost surely, 2^{38781551743781} is an apocalyptic number.

It is an amenable number.

38781551743781 is a deficient number, since it is larger than the sum of its proper divisors (10433319520603).

38781551743781 is a wasteful number, since it uses less digits than its factorization.

38781551743781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635321 (or 635314 counting only the distinct ones).

The product of its digits is 158054400, while the sum is 68.

The spelling of 38781551743781 in words is "thirty-eight trillion, seven hundred eighty-one billion, five hundred fifty-one million, seven hundred forty-three thousand, seven hundred eighty-one".