660172137 has 4 divisors (see below), whose sum is σ = 880229520. Its totient is φ = 440114756.

The previous prime is 660172109. The next prime is 660172159. The reversal of 660172137 is 731271066.

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 660172137 - 2⁸ = 660171881 is a prime.

It is a super-2 number, since 2×660172137² = 871654500942293538, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 660172098 and 660172107.

It is not an unprimeable number, because it can be changed into a prime (660171137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110028687 + ... + 110028692.

It is an arithmetic number, because the mean of its divisors is an integer number (220057380).

Almost surely, 2^660172137 is an apocalyptic number.

It is an amenable number.

660172137 is a deficient number, since it is larger than the sum of its proper divisors (220057383).

660172137 is a wasteful number, since it uses less digits than its factorization.

660172137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220057382.

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 660172137 is about 25693.8151507323. The cubic root of 660172137 is about 870.7344557642.

The spelling of 660172137 in words is "six hundred sixty million, one hundred seventy-two thousand, one hundred thirty-seven".