661542504343 has 8 divisors (see below), whose sum is σ = 756054938912. Its totient is φ = 567031660416.

The previous prime is 661542504323. The next prime is 661542504361. The reversal of 661542504343 is 343405245166.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661542504343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 661542504343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661542504313) 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, 692971 + ... + 1342867.

It is an arithmetic number, because the mean of its divisors is an integer number (94506867364).

Almost surely, 2^661542504343 is an apocalyptic number.

661542504343 is a deficient number, since it is larger than the sum of its proper divisors (94512434569).

661542504343 is a wasteful number, since it uses less digits than its factorization.

661542504343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795321.

The product of its (nonzero) digits is 1036800, while the sum is 43.

The spelling of 661542504343 in words is "six hundred sixty-one billion, five hundred forty-two million, five hundred four thousand, three hundred forty-three".