4157888831521 has 8 divisors (see below), whose sum is σ = 4301836738920. Its totient is φ = 4013979086208.

The previous prime is 4157888831519. The next prime is 4157888831527. The reversal of 4157888831521 is 1251388887514.

It can be written as a sum of positive squares in 4 ways, for example, as 2521188230625 + 1636700600896 = 1587825^2 + 1279336^2 .

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 4157888831521 - 2¹ = 4157888831519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4157888831521.

It is not an unprimeable number, because it can be changed into a prime (4157888831527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9318756 + ... + 9754741.

It is an arithmetic number, because the mean of its divisors is an integer number (537729592365).

Almost surely, 2^{4157888831521} is an apocalyptic number.

It is an amenable number.

4157888831521 is a deficient number, since it is larger than the sum of its proper divisors (143947907399).

4157888831521 is a wasteful number, since it uses less digits than its factorization.

4157888831521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19081043.

The product of its digits is 17203200, while the sum is 61.

The spelling of 4157888831521 in words is "four trillion, one hundred fifty-seven billion, eight hundred eighty-eight million, eight hundred thirty-one thousand, five hundred twenty-one".