661441701 has 8 divisors (see below), whose sum is σ = 882828864. Its totient is φ = 440507840.

The previous prime is 661441667. The next prime is 661441709. The reversal of 661441701 is 107144166.

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 661441701 - 2⁹ = 661441189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661441709) 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, 109905 + ... + 115766.

It is an arithmetic number, because the mean of its divisors is an integer number (110353608).

Almost surely, 2^661441701 is an apocalyptic number.

It is an amenable number.

661441701 is a deficient number, since it is larger than the sum of its proper divisors (221387163).

661441701 is a wasteful number, since it uses less digits than its factorization.

661441701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226651.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 661441701 is about 25718.5089186757. The cubic root of 661441701 is about 871.2922624270.

Adding to 661441701 its reverse (107144166), we get a palindrome (768585867).

The spelling of 661441701 in words is "six hundred sixty-one million, four hundred forty-one thousand, seven hundred one".