85642605647 has 2 divisors, whose sum is σ = 85642605648. Its totient is φ = 85642605646.

The previous prime is 85642605641. The next prime is 85642605689. The reversal of 85642605647 is 74650624658.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85642605647 - 2¹⁰ = 85642604623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85642605641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42821302823 + 42821302824.

It is an arithmetic number, because the mean of its divisors is an integer number (42821302824).

Almost surely, 2^85642605647 is an apocalyptic number.

85642605647 is a deficient number, since it is larger than the sum of its proper divisors (1).

85642605647 is an equidigital number, since it uses as much as digits as its factorization.

85642605647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9676800, while the sum is 53.

The spelling of 85642605647 in words is "eighty-five billion, six hundred forty-two million, six hundred five thousand, six hundred forty-seven".