661048653 has 8 divisors (see below), whose sum is σ = 893472448. Its totient is φ = 434661984.

The previous prime is 661048639. The next prime is 661048673. The reversal of 661048653 is 356840166.

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

It is not a de Polignac number, because 661048653 - 2⁴ = 661048637 is a prime.

It is a super-2 number, since 2×661048653² = 873970643266228818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661048673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1509025 + ... + 1509462.

It is an arithmetic number, because the mean of its divisors is an integer number (111684056).

Almost surely, 2^661048653 is an apocalyptic number.

It is an amenable number.

661048653 is a deficient number, since it is larger than the sum of its proper divisors (232423795).

661048653 is a wasteful number, since it uses less digits than its factorization.

661048653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3018563.

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 661048653 is about 25710.8664381425. The cubic root of 661048653 is about 871.1196457845.

The spelling of 661048653 in words is "six hundred sixty-one million, forty-eight thousand, six hundred fifty-three".