661606510 has 16 divisors (see below), whose sum is σ = 1260944496. Its totient is φ = 249075328.

The previous prime is 661606487. The next prime is 661606511. The reversal of 661606510 is 15606166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661606511) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1945732 + ... + 1946071.

It is an arithmetic number, because the mean of its divisors is an integer number (78809031).

Almost surely, 2^661606510 is an apocalyptic number.

661606510 is a deficient number, since it is larger than the sum of its proper divisors (599337986).

661606510 is a wasteful number, since it uses less digits than its factorization.

661606510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3891827.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 661606510 is about 25721.7128123304. The cubic root of 661606510 is about 871.3646219821.

The spelling of 661606510 in words is "six hundred sixty-one million, six hundred six thousand, five hundred ten".