661002343 has 4 divisors (see below), whose sum is σ = 695791960. Its totient is φ = 626212728.

The previous prime is 661002337. The next prime is 661002383. The reversal of 661002343 is 343200166.

661002343 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 an emirpimes, since its reverse is a distinct semiprime: 343200166 = 2 ⋅171600083.

It is a cyclic number.

It is not a de Polignac number, because 661002343 - 2²⁵ = 627447911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661002383) 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, 17394780 + ... + 17394817.

It is an arithmetic number, because the mean of its divisors is an integer number (173947990).

Almost surely, 2^661002343 is an apocalyptic number.

661002343 is a deficient number, since it is larger than the sum of its proper divisors (34789617).

661002343 is a wasteful number, since it uses less digits than its factorization.

661002343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34789616.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 661002343 is about 25709.9658303935. The cubic root of 661002343 is about 871.0993031100.

The spelling of 661002343 in words is "six hundred sixty-one million, two thousand, three hundred forty-three".