665725101 has 8 divisors (see below), whose sum is σ = 894409824. Its totient is φ = 440428560.

The previous prime is 665725079. The next prime is 665725111. The reversal of 665725101 is 101527566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 665725101 - 2⁵ = 665725069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665725111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 846586 + ... + 847371.

It is an arithmetic number, because the mean of its divisors is an integer number (111801228).

Almost surely, 2^665725101 is an apocalyptic number.

It is an amenable number.

665725101 is a deficient number, since it is larger than the sum of its proper divisors (228684723).

665725101 is a wasteful number, since it uses less digits than its factorization.

665725101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694091.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 665725101 is about 25801.6491914761. The cubic root of 665725101 is about 873.1690042806.

The spelling of 665725101 in words is "six hundred sixty-five million, seven hundred twenty-five thousand, one hundred one".