661502142 has 48 divisors (see below), whose sum is σ = 1646641152. Its totient is φ = 188004240.

The previous prime is 661502137. The next prime is 661502161. The reversal of 661502142 is 241205166.

661502142 is a `hidden beast` number, since 6 + 615 + 0 + 2 + 1 + 42 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10323 + ... + 37809.

It is an arithmetic number, because the mean of its divisors is an integer number (34305024).

Almost surely, 2^661502142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661502142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (823320576).

661502142 is an abundant number, since it is smaller than the sum of its proper divisors (985139010).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661502142 is a wasteful number, since it uses less digits than its factorization.

661502142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27693 (or 27690 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 661502142 is about 25719.6839405153. The cubic root of 661502142 is about 871.3188005036.

The spelling of 661502142 in words is "six hundred sixty-one million, five hundred two thousand, one hundred forty-two".