661153352263 has 2 divisors, whose sum is σ = 661153352264. Its totient is φ = 661153352262.

The previous prime is 661153352257. The next prime is 661153352267. The reversal of 661153352263 is 362253351166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661153352263 - 2²⁵ = 661119797831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661153352267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330576676131 + 330576676132.

It is an arithmetic number, because the mean of its divisors is an integer number (330576676132).

Almost surely, 2^661153352263 is an apocalyptic number.

661153352263 is a deficient number, since it is larger than the sum of its proper divisors (1).

661153352263 is an equidigital number, since it uses as much as digits as its factorization.

661153352263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 583200, while the sum is 43.

The spelling of 661153352263 in words is "six hundred sixty-one billion, one hundred fifty-three million, three hundred fifty-two thousand, two hundred sixty-three".