661361434 has 4 divisors (see below), whose sum is σ = 992042154. Its totient is φ = 330680716.

The previous prime is 661361431. The next prime is 661361483. The reversal of 661361434 is 434163166.

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., 416282409 + 245079025 = 20403^2 + 15655^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 661361434.

It is not an unprimeable number, because it can be changed into a prime (661361431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165340357 + ... + 165340360.

Almost surely, 2^661361434 is an apocalyptic number.

661361434 is a deficient number, since it is larger than the sum of its proper divisors (330680720).

661361434 is a wasteful number, since it uses less digits than its factorization.

661361434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330680719.

The product of its digits is 31104, while the sum is 34.

The square root of 661361434 is about 25716.9483803969. The cubic root of 661361434 is about 871.2570167683.

The spelling of 661361434 in words is "six hundred sixty-one million, three hundred sixty-one thousand, four hundred thirty-four".