661500002 has 4 divisors (see below), whose sum is σ = 992250006. Its totient is φ = 330750000.

The previous prime is 661499999. The next prime is 661500013. The reversal of 661500002 is 200005166.

661500002 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 610534681 + 50965321 = 24709^2 + 7139^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165374999 + ... + 165375002.

Almost surely, 2^661500002 is an apocalyptic number.

661500002 is a deficient number, since it is larger than the sum of its proper divisors (330750004).

661500002 is a wasteful number, since it uses less digits than its factorization.

661500002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330750003.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 661500002 is about 25719.6423381042. The cubic root of 661500002 is about 871.3178609127.

Adding to 661500002 its reverse (200005166), we get a palindrome (861505168).

The spelling of 661500002 in words is "six hundred sixty-one million, five hundred thousand, two".