12571181377 has 6 divisors (see below), whose sum is σ = 13019619158. Its totient is φ = 12137691552.

The previous prime is 12571181341. The next prime is 12571181393. The reversal of 12571181377 is 77318117521.

It can be written as a sum of positive squares in 3 ways, for example, as 4364452096 + 8206729281 = 66064^2 + 90591^2 .

It is not a de Polignac number, because 12571181377 - 2³¹ = 10423697729 is a prime.

It is a super-2 number, since 2×12571181377² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12571181317) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7473108 + ... + 7474789.

Almost surely, 2^12571181377 is an apocalyptic number.

It is an amenable number.

12571181377 is a deficient number, since it is larger than the sum of its proper divisors (448437781).

12571181377 is an equidigital number, since it uses as much as digits as its factorization.

12571181377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14947955 (or 14947926 counting only the distinct ones).

The product of its digits is 82320, while the sum is 43.

Adding to 12571181377 its reverse (77318117521), we get a palindrome (89889298898).

The spelling of 12571181377 in words is "twelve billion, five hundred seventy-one million, one hundred eighty-one thousand, three hundred seventy-seven".