99639146127481 has 9 divisors (see below), whose sum is σ = 105845224764621. Its totient is φ = 93777860173632.

The previous prime is 99639146127461. The next prime is 99639146127487. The reversal of 99639146127481 is 18472164193699.

The square root of 99639146127481 is 9981941.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 42144233275881 + 57494912851600 = 6491859^2 + 7582540^2 .

It is not a de Polignac number, because 99639146127481 - 2⁵ = 99639146127449 is a prime.

It is a super-2 number, since 2×99639146127481² (a number of 29 digits) contains 22 as substring.

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 99639146127481.

It is not an unprimeable number, because it can be changed into a prime (99639146127487) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 169399411 + ... + 169986583.

Almost surely, 2^{99639146127481} is an apocalyptic number.

99639146127481 is the 9981941-st square number.

99639146127481 is the 4990971-st centered octagonal number.

It is an amenable number.

99639146127481 is a deficient number, since it is larger than the sum of its proper divisors (6206078637140).

99639146127481 is an frugal number, since it uses more digits than its factorization.

99639146127481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174380 (or 587190 counting only the distinct ones).

The product of its digits is 141087744, while the sum is 70.

The spelling of 99639146127481 in words is "ninety-nine trillion, six hundred thirty-nine billion, one hundred forty-six million, one hundred twenty-seven thousand, four hundred eighty-one".