660556141 has 4 divisors (see below), whose sum is σ = 754921312. Its totient is φ = 566190972.

The previous prime is 660556133. The next prime is 660556151. The reversal of 660556141 is 141655066.

It is a happy number.

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 660556141 - 2³ = 660556133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 660556097 and 660556106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660556121) 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, 47182575 + ... + 47182588.

It is an arithmetic number, because the mean of its divisors is an integer number (188730328).

Almost surely, 2^660556141 is an apocalyptic number.

It is an amenable number.

660556141 is a deficient number, since it is larger than the sum of its proper divisors (94365171).

660556141 is an equidigital number, since it uses as much as digits as its factorization.

660556141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94365170.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 660556141 is about 25701.2867576703. The cubic root of 660556141 is about 870.9032504799.

The spelling of 660556141 in words is "six hundred sixty million, five hundred fifty-six thousand, one hundred forty-one".