78384633601 has 2 divisors, whose sum is σ = 78384633602. Its totient is φ = 78384633600.

The previous prime is 78384633493. The next prime is 78384633619. The reversal of 78384633601 is 10633648387.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63088880625 + 15295752976 = 251175^2 + 123676^2 .

It is a cyclic number.

It is not a de Polignac number, because 78384633601 - 2¹¹ = 78384631553 is a prime.

It is a super-2 number, since 2×78384633601² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78384633631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39192316800 + 39192316801.

It is an arithmetic number, because the mean of its divisors is an integer number (39192316801).

Almost surely, 2^78384633601 is an apocalyptic number.

It is an amenable number.

78384633601 is a deficient number, since it is larger than the sum of its proper divisors (1).

78384633601 is an equidigital number, since it uses as much as digits as its factorization.

78384633601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 49.

The spelling of 78384633601 in words is "seventy-eight billion, three hundred eighty-four million, six hundred thirty-three thousand, six hundred one".