661068432 has 160 divisors (see below), whose sum is σ = 1947792000. Its totient is φ = 214617600.

The previous prime is 661068389. The next prime is 661068437. The reversal of 661068432 is 234860166.

661068432 is a `hidden beast` number, since 6 + 610 + 6 + 8 + 4 + 32 = 666.

It is a super-2 number, since 2×661068432² = 874022943573877248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661068437) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4755819 + ... + 4755957.

It is an arithmetic number, because the mean of its divisors is an integer number (12173700).

Almost surely, 2^661068432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661068432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (973896000).

661068432 is an abundant number, since it is smaller than the sum of its proper divisors (1286723568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661068432 is a wasteful number, since it uses less digits than its factorization.

661068432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366 (or 354 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 661068432 is about 25711.2510780786. The cubic root of 661068432 is about 871.1283338509.

The spelling of 661068432 in words is "six hundred sixty-one million, sixty-eight thousand, four hundred thirty-two".