660747541 has 2 divisors, whose sum is σ = 660747542. Its totient is φ = 660747540.

The previous prime is 660747539. The next prime is 660747557. The reversal of 660747541 is 145747066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 559322500 + 101425041 = 23650^2 + 10071^2 .

It is a cyclic number.

It is not a de Polignac number, because 660747541 - 2¹ = 660747539 is a prime.

Together with 660747539, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 660747494 and 660747503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660747341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330373770 + 330373771.

It is an arithmetic number, because the mean of its divisors is an integer number (330373771).

Almost surely, 2^660747541 is an apocalyptic number.

It is an amenable number.

660747541 is a deficient number, since it is larger than the sum of its proper divisors (1).

660747541 is an equidigital number, since it uses as much as digits as its factorization.

660747541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141120, while the sum is 40.

The square root of 660747541 is about 25705.0100369558. The cubic root of 660747541 is about 870.9873587913.

The spelling of 660747541 in words is "six hundred sixty million, seven hundred forty-seven thousand, five hundred forty-one".