661533933 has 8 divisors (see below), whose sum is σ = 882904896. Its totient is φ = 440592800.

The previous prime is 661533931. The next prime is 661533949. The reversal of 661533933 is 339335166.

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

It is a cyclic number.

It is not a de Polignac number, because 661533933 - 2¹ = 661533931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 661533891 and 661533900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661533931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103848 + ... + 110033.

It is an arithmetic number, because the mean of its divisors is an integer number (110363112).

Almost surely, 2^661533933 is an apocalyptic number.

It is an amenable number.

661533933 is a deficient number, since it is larger than the sum of its proper divisors (221370963).

661533933 is a wasteful number, since it uses less digits than its factorization.

661533933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214915.

The product of its digits is 131220, while the sum is 39.

The square root of 661533933 is about 25720.3019616800. The cubic root of 661533933 is about 871.3327584590.

The spelling of 661533933 in words is "six hundred sixty-one million, five hundred thirty-three thousand, nine hundred thirty-three".