661601024 has 36 divisors (see below), whose sum is σ = 1509281424. Its totient is φ = 283542528.

The previous prime is 661601023. The next prime is 661601047. The reversal of 661601024 is 420106166.

It is a happy number.

661601024 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 661600984 and 661601002.

It is not an unprimeable number, because it can be changed into a prime (661601021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182807 + ... + 186390.

It is an arithmetic number, because the mean of its divisors is an integer number (41924484).

Almost surely, 2^661601024 is an apocalyptic number.

661601024 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

661601024 is an abundant number, since it is smaller than the sum of its proper divisors (847680400).

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

661601024 is an equidigital number, since it uses as much as digits as its factorization.

661601024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369220 (or 369206 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 661601024 is about 25721.6061706885. The cubic root of 661601024 is about 871.3622135417.

The spelling of 661601024 in words is "six hundred sixty-one million, six hundred one thousand, twenty-four".