660472405 has 4 divisors (see below), whose sum is σ = 792566892. Its totient is φ = 528377920.

The previous prime is 660472369. The next prime is 660472409. The reversal of 660472405 is 504274066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 167365969 + 493106436 = 12937^2 + 22206^2 .

It is not a de Polignac number, because 660472405 - 2⁹ = 660471893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660472409) 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, 66047236 + ... + 66047245.

It is an arithmetic number, because the mean of its divisors is an integer number (198141723).

Almost surely, 2^660472405 is an apocalyptic number.

It is an amenable number.

660472405 is a deficient number, since it is larger than the sum of its proper divisors (132094487).

660472405 is a wasteful number, since it uses less digits than its factorization.

660472405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132094486.

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 660472405 is about 25699.6576825451. The cubic root of 660472405 is about 870.8664486439.

The spelling of 660472405 in words is "six hundred sixty million, four hundred seventy-two thousand, four hundred five".