661385141323 has 2 divisors, whose sum is σ = 661385141324. Its totient is φ = 661385141322.

The previous prime is 661385141311. The next prime is 661385141369. The reversal of 661385141323 is 323141583166.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661385141323 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 661385141323.

It is not a weakly prime, because it can be changed into another prime (661385142323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330692570661 + 330692570662.

It is an arithmetic number, because the mean of its divisors is an integer number (330692570662).

Almost surely, 2^661385141323 is an apocalyptic number.

661385141323 is a deficient number, since it is larger than the sum of its proper divisors (1).

661385141323 is an equidigital number, since it uses as much as digits as its factorization.

661385141323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 43.

The spelling of 661385141323 in words is "six hundred sixty-one billion, three hundred eighty-five million, one hundred forty-one thousand, three hundred twenty-three".