646118147 has 2 divisors, whose sum is σ = 646118148. Its totient is φ = 646118146.

The previous prime is 646118131. The next prime is 646118183. The reversal of 646118147 is 741811646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646118147 - 2⁴ = 646118131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646118147.

It is not a weakly prime, because it can be changed into another prime (646118117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323059073 + 323059074.

It is an arithmetic number, because the mean of its divisors is an integer number (323059074).

Almost surely, 2^646118147 is an apocalyptic number.

646118147 is a deficient number, since it is larger than the sum of its proper divisors (1).

646118147 is an equidigital number, since it uses as much as digits as its factorization.

646118147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 38.

The square root of 646118147 is about 25418.8541637895. The cubic root of 646118147 is about 864.5112442637.

The spelling of 646118147 in words is "six hundred forty-six million, one hundred eighteen thousand, one hundred forty-seven".