12640161831 has 16 divisors (see below), whose sum is σ = 18507456768. Its totient is φ = 7609968000.

The previous prime is 12640161823. The next prime is 12640161839. The reversal of 12640161831 is 13816104621.

It is an interprime number because it is at equal distance from previous prime (12640161823) and next prime (12640161839).

It is not a de Polignac number, because 12640161831 - 2³ = 12640161823 is a prime.

It is a super-2 number, since 2×12640161831² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 12640161792 and 12640161801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640161839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1263346 + ... + 1273311.

It is an arithmetic number, because the mean of its divisors is an integer number (1156716048).

Almost surely, 2^12640161831 is an apocalyptic number.

12640161831 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12640161831 is a deficient number, since it is larger than the sum of its proper divisors (5867294937).

12640161831 is a wasteful number, since it uses less digits than its factorization.

12640161831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2536822.

The product of its (nonzero) digits is 6912, while the sum is 33.

It can be divided in two parts, 12640 and 161831, that added together give a palindrome (174471).

The spelling of 12640161831 in words is "twelve billion, six hundred forty million, one hundred sixty-one thousand, eight hundred thirty-one".