661010263 has 2 divisors, whose sum is σ = 661010264. Its totient is φ = 661010262.

The previous prime is 661010249. The next prime is 661010267. The reversal of 661010263 is 362010166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661010263 - 2²⁵ = 627455831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661010267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330505131 + 330505132.

It is an arithmetic number, because the mean of its divisors is an integer number (330505132).

Almost surely, 2^661010263 is an apocalyptic number.

661010263 is a deficient number, since it is larger than the sum of its proper divisors (1).

661010263 is an equidigital number, since it uses as much as digits as its factorization.

661010263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 661010263 is about 25710.1198558078. The cubic root of 661010263 is about 871.1027822095.

The spelling of 661010263 in words is "six hundred sixty-one million, ten thousand, two hundred sixty-three".