661740010 has 8 divisors (see below), whose sum is σ = 1191132036. Its totient is φ = 264696000.

The previous prime is 661739987. The next prime is 661740071. The reversal of 661740010 is 10047166.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 627552601 + 34187409 = 25051^2 + 5847^2 .

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

It is an unprimeable number.

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, 33086991 + ... + 33087010.

Almost surely, 2^661740010 is an apocalyptic number.

661740010 is a deficient number, since it is larger than the sum of its proper divisors (529392026).

661740010 is a wasteful number, since it uses less digits than its factorization.

661740010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66174008.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 661740010 is about 25724.3077652247. The cubic root of 661740010 is about 871.4232264808.

Adding to 661740010 its reverse (10047166), we get a palindrome (671787176).

The spelling of 661740010 in words is "six hundred sixty-one million, seven hundred forty thousand, ten".