6686529425 has 6 divisors (see below), whose sum is σ = 8291296518. Its totient is φ = 5349223520.

The previous prime is 6686529359. The next prime is 6686529491. The reversal of 6686529425 is 5249256866.

It is an interprime number because it is at equal distance from previous prime (6686529359) and next prime (6686529491).

It can be written as a sum of positive squares in 3 ways, for example, as 829382401 + 5857147024 = 28799^2 + 76532^2 .

It is not a de Polignac number, because 6686529425 - 2²⁰ = 6685480849 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 133730564 + ... + 133730613.

It is an arithmetic number, because the mean of its divisors is an integer number (1381882753).

Almost surely, 2^6686529425 is an apocalyptic number.

It is an amenable number.

6686529425 is a deficient number, since it is larger than the sum of its proper divisors (1604767093).

6686529425 is a wasteful number, since it uses less digits than its factorization.

6686529425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267461187 (or 267461182 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 53.

The square root of 6686529425 is about 81771.2016849453. The cubic root of 6686529425 is about 1883.9393616203.

The spelling of 6686529425 in words is "six billion, six hundred eighty-six million, five hundred twenty-nine thousand, four hundred twenty-five".