38578145581 has 2 divisors, whose sum is σ = 38578145582. Its totient is φ = 38578145580.

The previous prime is 38578145561. The next prime is 38578145629. The reversal of 38578145581 is 18554187583.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35181004356 + 3397141225 = 187566^2 + 58285^2 .

It is a cyclic number.

It is not a de Polignac number, because 38578145581 - 2¹⁹ = 38577621293 is a prime.

It is a super-2 number, since 2×38578145581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38578145521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19289072790 + 19289072791.

It is an arithmetic number, because the mean of its divisors is an integer number (19289072791).

Almost surely, 2^38578145581 is an apocalyptic number.

It is an amenable number.

38578145581 is a deficient number, since it is larger than the sum of its proper divisors (1).

38578145581 is an equidigital number, since it uses as much as digits as its factorization.

38578145581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376000, while the sum is 55.

The spelling of 38578145581 in words is "thirty-eight billion, five hundred seventy-eight million, one hundred forty-five thousand, five hundred eighty-one".