6686172031 has 32 divisors (see below), whose sum is σ = 8496506880. Its totient is φ = 5110560000.

The previous prime is 6686172007. The next prime is 6686172043. The reversal of 6686172031 is 1302716866.

It is a happy number.

It is not a de Polignac number, because 6686172031 - 2²¹ = 6684074879 is a prime.

It is a super-2 number, since 2×6686172031² = 89409792856253329922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6686172091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 951531 + ... + 958531.

It is an arithmetic number, because the mean of its divisors is an integer number (265515840).

Almost surely, 2^6686172031 is an apocalyptic number.

6686172031 is a deficient number, since it is larger than the sum of its proper divisors (1810334849).

6686172031 is a wasteful number, since it uses less digits than its factorization.

6686172031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7255.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 6686172031 is about 81769.0163264791. The cubic root of 6686172031 is about 1883.9057955963.

Adding to 6686172031 its reverse (1302716866), we get a palindrome (7988888897).

The spelling of 6686172031 in words is "six billion, six hundred eighty-six million, one hundred seventy-two thousand, thirty-one".