73856665847 has 2 divisors, whose sum is σ = 73856665848. Its totient is φ = 73856665846.

The previous prime is 73856665843. The next prime is 73856665873. The reversal of 73856665847 is 74856665837.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 73856665847 - 2² = 73856665843 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73856665843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36928332923 + 36928332924.

It is an arithmetic number, because the mean of its divisors is an integer number (36928332924).

Almost surely, 2^73856665847 is an apocalyptic number.

73856665847 is a deficient number, since it is larger than the sum of its proper divisors (1).

73856665847 is an equidigital number, since it uses as much as digits as its factorization.

73856665847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 203212800, while the sum is 65.

The spelling of 73856665847 in words is "seventy-three billion, eight hundred fifty-six million, six hundred sixty-five thousand, eight hundred forty-seven".