5171518787938 has 4 divisors (see below), whose sum is σ = 7757278181910. Its totient is φ = 2585759393968.

The previous prime is 5171518787933. The next prime is 5171518787989. The reversal of 5171518787938 is 8397878151715.

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

It can be written as a sum of positive squares in only one way, i.e., 4602041786169 + 569477001769 = 2145237^2 + 754637^2 .

It is a super-2 number, since 2×5171518787938² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (5171518787933) 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 as a sum of consecutive naturals, namely, 1292879696983 + ... + 1292879696986.

Almost surely, 2^{5171518787938} is an apocalyptic number.

5171518787938 is a deficient number, since it is larger than the sum of its proper divisors (2585759393972).

5171518787938 is a wasteful number, since it uses less digits than its factorization.

5171518787938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2585759393971.

The product of its digits is 118540800, while the sum is 70.

The spelling of 5171518787938 in words is "five trillion, one hundred seventy-one billion, five hundred eighteen million, seven hundred eighty-seven thousand, nine hundred thirty-eight".