664125541 has 4 divisors (see below), whose sum is σ = 664219584. Its totient is φ = 664031500.

The previous prime is 664125533. The next prime is 664125547. The reversal of 664125541 is 145521466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 664125541 - 2³ = 664125533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664125497 and 664125506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664125547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35485 + ... + 50866.

It is an arithmetic number, because the mean of its divisors is an integer number (166054896).

Almost surely, 2^664125541 is an apocalyptic number.

It is an amenable number.

664125541 is a deficient number, since it is larger than the sum of its proper divisors (94043).

664125541 is an equidigital number, since it uses as much as digits as its factorization.

664125541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94042.

The product of its digits is 28800, while the sum is 34.

The square root of 664125541 is about 25770.6333061491. The cubic root of 664125541 is about 872.4691126248.

The spelling of 664125541 in words is "six hundred sixty-four million, one hundred twenty-five thousand, five hundred forty-one".