661185275459 has 2 divisors, whose sum is σ = 661185275460. Its totient is φ = 661185275458.

The previous prime is 661185275411. The next prime is 661185275473. The reversal of 661185275459 is 954572581166.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661185275459 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 661185275398 and 661185275407.

It is not a weakly prime, because it can be changed into another prime (661185275479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330592637729 + 330592637730.

It is an arithmetic number, because the mean of its divisors is an integer number (330592637730).

Almost surely, 2^661185275459 is an apocalyptic number.

661185275459 is a deficient number, since it is larger than the sum of its proper divisors (1).

661185275459 is an equidigital number, since it uses as much as digits as its factorization.

661185275459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144000, while the sum is 59.

The spelling of 661185275459 in words is "six hundred sixty-one billion, one hundred eighty-five million, two hundred seventy-five thousand, four hundred fifty-nine".