661132042 has 4 divisors (see below), whose sum is σ = 991698066. Its totient is φ = 330566020.

The previous prime is 661132039. The next prime is 661132051. The reversal of 661132042 is 240231166.

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., 504406681 + 156725361 = 22459^2 + 12519^2 .

It is a junction number, because it is equal to n+sod(n) for n = 661131998 and 661132016.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165283009 + ... + 165283012.

Almost surely, 2^661132042 is an apocalyptic number.

661132042 is a deficient number, since it is larger than the sum of its proper divisors (330566024).

661132042 is a wasteful number, since it uses less digits than its factorization.

661132042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330566023.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 661132042 is about 25712.4880554177. The cubic root of 661132042 is about 871.1562738207.

The spelling of 661132042 in words is "six hundred sixty-one million, one hundred thirty-two thousand, forty-two".