661512502 has 8 divisors (see below), whose sum is σ = 1134021456. Its totient is φ = 283505352.

The previous prime is 661512479. The next prime is 661512521. The reversal of 661512502 is 205215166.

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

It is a congruent number.

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, 23625433 + ... + 23625460.

It is an arithmetic number, because the mean of its divisors is an integer number (141752682).

Almost surely, 2^661512502 is an apocalyptic number.

661512502 is a deficient number, since it is larger than the sum of its proper divisors (472508954).

661512502 is a wasteful number, since it uses less digits than its factorization.

661512502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47250902.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 661512502 is about 25719.8853418906. The cubic root of 661512502 is about 871.3233491488.

Adding to 661512502 its reverse (205215166), we get a palindrome (866727668).

The spelling of 661512502 in words is "six hundred sixty-one million, five hundred twelve thousand, five hundred two".