661533434 has 16 divisors (see below), whose sum is σ = 1019844000. Its totient is φ = 321598224.

The previous prime is 661533421. The next prime is 661533443. The reversal of 661533434 is 434335166.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 661533394 and 661533403.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153197 + ... + 157455.

It is an arithmetic number, because the mean of its divisors is an integer number (63740250).

Almost surely, 2^661533434 is an apocalyptic number.

661533434 is a deficient number, since it is larger than the sum of its proper divisors (358310566).

661533434 is a wasteful number, since it uses less digits than its factorization.

661533434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6397.

The product of its digits is 77760, while the sum is 35.

The square root of 661533434 is about 25720.2922611700. The cubic root of 661533434 is about 871.3325393747.

The spelling of 661533434 in words is "six hundred sixty-one million, five hundred thirty-three thousand, four hundred thirty-four".