660254641 has 4 divisors (see below), whose sum is σ = 660397300. Its totient is φ = 660111984.

The previous prime is 660254627. The next prime is 660254657. The reversal of 660254641 is 146452066.

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 32251041 + 628003600 = 5679^2 + 25060^2 .

It is a cyclic number.

It is not a de Polignac number, because 660254641 - 2¹³ = 660246449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 660254597 and 660254606.

It is not an unprimeable number, because it can be changed into a prime (660254341) 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, 64146 + ... + 73723.

It is an arithmetic number, because the mean of its divisors is an integer number (165099325).

Almost surely, 2^660254641 is an apocalyptic number.

It is an amenable number.

660254641 is a deficient number, since it is larger than the sum of its proper divisors (142659).

660254641 is a wasteful number, since it uses less digits than its factorization.

660254641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142658.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 660254641 is about 25695.4206231383. The cubic root of 660254641 is about 870.7707271542.

The spelling of 660254641 in words is "six hundred sixty million, two hundred fifty-four thousand, six hundred forty-one".