661060637 has 2 divisors, whose sum is σ = 661060638. Its totient is φ = 661060636.

The previous prime is 661060627. The next prime is 661060639. The reversal of 661060637 is 736060166.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 408282436 + 252778201 = 20206^2 + 15899^2 .

It is a cyclic number.

It is not a de Polignac number, because 661060637 - 2⁸ = 661060381 is a prime.

Together with 661060639, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 661060597 and 661060606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661060639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330530318 + 330530319.

It is an arithmetic number, because the mean of its divisors is an integer number (330530319).

Almost surely, 2^661060637 is an apocalyptic number.

It is an amenable number.

661060637 is a deficient number, since it is larger than the sum of its proper divisors (1).

661060637 is an equidigital number, since it uses as much as digits as its factorization.

661060637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 661060637 is about 25711.0994902980. The cubic root of 661060637 is about 871.1249098624.

The spelling of 661060637 in words is "six hundred sixty-one million, sixty thousand, six hundred thirty-seven".