661464601 has 4 divisors (see below), whose sum is σ = 755959552. Its totient is φ = 566969652.

The previous prime is 661464593. The next prime is 661464619. The reversal of 661464601 is 106464166.

661464601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 661464601 - 2³ = 661464593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661468601) 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, 47247465 + ... + 47247478.

It is an arithmetic number, because the mean of its divisors is an integer number (188989888).

Almost surely, 2^661464601 is an apocalyptic number.

It is an amenable number.

661464601 is a deficient number, since it is larger than the sum of its proper divisors (94494951).

661464601 is an equidigital number, since it uses as much as digits as its factorization.

661464601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94494950.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 661464601 is about 25718.9541194816. The cubic root of 661464601 is about 871.3023174137.

The spelling of 661464601 in words is "six hundred sixty-one million, four hundred sixty-four thousand, six hundred one".