661650434 has 8 divisors (see below), whose sum is σ = 992990208. Its totient is φ = 330653700.

The previous prime is 661650397. The next prime is 661650449. The reversal of 661650434 is 434056166.

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

It is a junction number, because it is equal to n+sod(n) for n = 661650394 and 661650403.

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, 80882 + ... + 88685.

It is an arithmetic number, because the mean of its divisors is an integer number (124123776).

Almost surely, 2^661650434 is an apocalyptic number.

661650434 is a deficient number, since it is larger than the sum of its proper divisors (331339774).

661650434 is a wasteful number, since it uses less digits than its factorization.

661650434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171520.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 661650434 is about 25722.5666293238. The cubic root of 661650434 is about 871.3839048298.

The spelling of 661650434 in words is "six hundred sixty-one million, six hundred fifty thousand, four hundred thirty-four".