661252343 has 4 divisors (see below), whose sum is σ = 661671648. Its totient is φ = 660833040.

The previous prime is 661252253. The next prime is 661252373. The reversal of 661252343 is 343252166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 661252343 - 2¹⁴ = 661235959 is a prime.

It is a super-2 number, since 2×661252343² = 874509322245979298, 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 (661252373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207278 + ... + 210443.

It is an arithmetic number, because the mean of its divisors is an integer number (165417912).

Almost surely, 2^661252343 is an apocalyptic number.

661252343 is a deficient number, since it is larger than the sum of its proper divisors (419305).

661252343 is a wasteful number, since it uses less digits than its factorization.

661252343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419304.

The product of its digits is 25920, while the sum is 32.

The square root of 661252343 is about 25714.8272986618. The cubic root of 661252343 is about 871.2091097689.

The spelling of 661252343 in words is "six hundred sixty-one million, two hundred fifty-two thousand, three hundred forty-three".