42991777181513 has 8 divisors (see below), whose sum is σ = 43417621963656. Its totient is φ = 42565936000000.

The previous prime is 42991777181417. The next prime is 42991777181569. The reversal of 42991777181513 is 31518177719924.

It can be written as a sum of positive squares in 4 ways, for example, as 8081074054729 + 34910703126784 = 2842723^2 + 5908528^2 .

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 42991777181513 - 2²⁴ = 42991760404297 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 42991777181513.

It is not an unprimeable number, because it can be changed into a prime (42991777141513) 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, 27519995 + ... + 29040207.

It is an arithmetic number, because the mean of its divisors is an integer number (5427202745457).

Almost surely, 2^{42991777181513} is an apocalyptic number.

It is an amenable number.

42991777181513 is a deficient number, since it is larger than the sum of its proper divisors (425844782143).

42991777181513 is a wasteful number, since it uses less digits than its factorization.

42991777181513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1800315.

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

The spelling of 42991777181513 in words is "forty-two trillion, nine hundred ninety-one billion, seven hundred seventy-seven million, one hundred eighty-one thousand, five hundred thirteen".