660561490 has 8 divisors (see below), whose sum is σ = 1189010700. Its totient is φ = 264224592.

The previous prime is 660561439. The next prime is 660561521. The reversal of 660561490 is 94165066.

It can be written as a sum of positive squares in 2 ways, for example, as 550793961 + 109767529 = 23469^2 + 10477^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33028065 + ... + 33028084.

Almost surely, 2^660561490 is an apocalyptic number.

660561490 is a deficient number, since it is larger than the sum of its proper divisors (528449210).

660561490 is a wasteful number, since it uses less digits than its factorization.

660561490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66056156.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 660561490 is about 25701.3908183974. The cubic root of 660561490 is about 870.9056012510.

The spelling of 660561490 in words is "six hundred sixty million, five hundred sixty-one thousand, four hundred ninety".