661010249 has 2 divisors, whose sum is σ = 661010250. Its totient is φ = 661010248.

The previous prime is 661010243. The next prime is 661010263. The reversal of 661010249 is 942010166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 403728649 + 257281600 = 20093^2 + 16040^2 .

It is a cyclic number.

It is not a de Polignac number, because 661010249 - 2¹² = 661006153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (661010243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330505124 + 330505125.

It is an arithmetic number, because the mean of its divisors is an integer number (330505125).

Almost surely, 2^661010249 is an apocalyptic number.

It is an amenable number.

661010249 is a deficient number, since it is larger than the sum of its proper divisors (1).

661010249 is an equidigital number, since it uses as much as digits as its factorization.

661010249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 661010249 is about 25710.1195835414. The cubic root of 661010249 is about 871.1027760597.

The spelling of 661010249 in words is "six hundred sixty-one million, ten thousand, two hundred forty-nine".