660659541 has 8 divisors (see below), whose sum is σ = 892030080. Its totient is φ = 434864352.

The previous prime is 660659513. The next prime is 660659551. The reversal of 660659541 is 145956066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 660659541 - 2⁷ = 660659413 is a prime.

It is a super-2 number, since 2×660659541² = 872942058228661362, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 660659493 and 660659502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660659501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1393560 + ... + 1394033.

It is an arithmetic number, because the mean of its divisors is an integer number (111503760).

Almost surely, 2^660659541 is an apocalyptic number.

It is an amenable number.

660659541 is a deficient number, since it is larger than the sum of its proper divisors (231370539).

660659541 is a wasteful number, since it uses less digits than its factorization.

660659541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2787675.

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 660659541 is about 25703.2982513918. The cubic root of 660659541 is about 870.9486903208.

The spelling of 660659541 in words is "six hundred sixty million, six hundred fifty-nine thousand, five hundred forty-one".