642612662147 has 2 divisors, whose sum is σ = 642612662148. Its totient is φ = 642612662146.

The previous prime is 642612662143. The next prime is 642612662179. The reversal of 642612662147 is 741266216246.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642612662147 - 2² = 642612662143 is a prime.

It is not a weakly prime, because it can be changed into another prime (642612662143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321306331073 + 321306331074.

It is an arithmetic number, because the mean of its divisors is an integer number (321306331074).

Almost surely, 2^642612662147 is an apocalyptic number.

642612662147 is a deficient number, since it is larger than the sum of its proper divisors (1).

642612662147 is an equidigital number, since it uses as much as digits as its factorization.

642612662147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 47.

The spelling of 642612662147 in words is "six hundred forty-two billion, six hundred twelve million, six hundred sixty-two thousand, one hundred forty-seven".