661131502 has 8 divisors (see below), whose sum is σ = 1025893800. Its totient is φ = 319166904.

The previous prime is 661131439. The next prime is 661131509. The reversal of 661131502 is 205131166.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661131509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5699352 + ... + 5699467.

It is an arithmetic number, because the mean of its divisors is an integer number (128236725).

Almost surely, 2^661131502 is an apocalyptic number.

661131502 is a deficient number, since it is larger than the sum of its proper divisors (364762298).

661131502 is a wasteful number, since it uses less digits than its factorization.

661131502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11398850.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 661131502 is about 25712.4775546815. The cubic root of 661131502 is about 871.1560366394.

Adding to 661131502 its reverse (205131166), we get a palindrome (866262668).

The spelling of 661131502 in words is "six hundred sixty-one million, one hundred thirty-one thousand, five hundred two".