661072147 has 2 divisors, whose sum is σ = 661072148. Its totient is φ = 661072146.

The previous prime is 661072133. The next prime is 661072157. The reversal of 661072147 is 741270166.

It is a happy number.

661072147 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661072147 - 2¹⁹ = 660547859 is a prime.

It is not a weakly prime, because it can be changed into another prime (661072157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330536073 + 330536074.

It is an arithmetic number, because the mean of its divisors is an integer number (330536074).

Almost surely, 2^661072147 is an apocalyptic number.

661072147 is a deficient number, since it is larger than the sum of its proper divisors (1).

661072147 is an equidigital number, since it uses as much as digits as its factorization.

661072147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 661072147 is about 25711.3233226141. The cubic root of 661072147 is about 871.1299656717.

The spelling of 661072147 in words is "six hundred sixty-one million, seventy-two thousand, one hundred forty-seven".