38778151997 has 8 divisors (see below), whose sum is σ = 42230313720. Its totient is φ = 35393022720.

The previous prime is 38778151991. The next prime is 38778152003. The reversal of 38778151997 is 79915187783.

38778151997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (38778151991) and next prime (38778152003).

It can be written as a sum of positive squares in 4 ways, for example, as 6270422596 + 32507729401 = 79186^2 + 180299^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 38778151997 - 2²⁸ = 38509716541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38778151991) 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, 16756904 + ... + 16759217.

It is an arithmetic number, because the mean of its divisors is an integer number (5278789215).

Almost surely, 2^38778151997 is an apocalyptic number.

It is an amenable number.

38778151997 is a deficient number, since it is larger than the sum of its proper divisors (3452161723).

38778151997 is a wasteful number, since it uses less digits than its factorization.

38778151997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33516223.

The product of its digits is 26671680, while the sum is 65.

The spelling of 38778151997 in words is "thirty-eight billion, seven hundred seventy-eight million, one hundred fifty-one thousand, nine hundred ninety-seven".