64661147 has 2 divisors, whose sum is σ = 64661148. Its totient is φ = 64661146.

The previous prime is 64661131. The next prime is 64661173. The reversal of 64661147 is 74116646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64661147 - 2⁴ = 64661131 is a prime.

It is not a weakly prime, because it can be changed into another prime (64661117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32330573 + 32330574.

It is an arithmetic number, because the mean of its divisors is an integer number (32330574).

Almost surely, 2^64661147 is an apocalyptic number.

64661147 is a deficient number, since it is larger than the sum of its proper divisors (1).

64661147 is an equidigital number, since it uses as much as digits as its factorization.

64661147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 35.

The square root of 64661147 is about 8041.2155175695. The cubic root of 64661147 is about 401.3726736128.

The spelling of 64661147 in words is "sixty-four million, six hundred sixty-one thousand, one hundred forty-seven".