38721155855357 has 4 divisors (see below), whose sum is σ = 38723145963516. Its totient is φ = 38719165747200.

The previous prime is 38721155855353. The next prime is 38721155855407. The reversal of 38721155855357 is 75355855112783.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31385866131481 + 7335289723876 = 5602309^2 + 2708374^2 .

It is a cyclic number.

It is not a de Polignac number, because 38721155855357 - 2² = 38721155855353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 38721155855293 and 38721155855302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38721155855353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 995024894 + ... + 995063807.

It is an arithmetic number, because the mean of its divisors is an integer number (9680786490879).

Almost surely, 2^{38721155855357} is an apocalyptic number.

It is an amenable number.

38721155855357 is a deficient number, since it is larger than the sum of its proper divisors (1990108159).

38721155855357 is a wasteful number, since it uses less digits than its factorization.

38721155855357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1990108158.

The product of its digits is 176400000, while the sum is 65.

The spelling of 38721155855357 in words is "thirty-eight trillion, seven hundred twenty-one billion, one hundred fifty-five million, eight hundred fifty-five thousand, three hundred fifty-seven".