78340636601 has 2 divisors, whose sum is σ = 78340636602. Its totient is φ = 78340636600.

The previous prime is 78340636573. The next prime is 78340636643. The reversal of 78340636601 is 10663604387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66318610576 + 12022026025 = 257524^2 + 109645^2 .

It is a cyclic number.

It is not a de Polignac number, because 78340636601 - 2²² = 78336442297 is a prime.

It is a super-2 number, since 2×78340636601² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78340636901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39170318300 + 39170318301.

It is an arithmetic number, because the mean of its divisors is an integer number (39170318301).

Almost surely, 2^78340636601 is an apocalyptic number.

It is an amenable number.

78340636601 is a deficient number, since it is larger than the sum of its proper divisors (1).

78340636601 is an equidigital number, since it uses as much as digits as its factorization.

78340636601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 44.

The spelling of 78340636601 in words is "seventy-eight billion, three hundred forty million, six hundred thirty-six thousand, six hundred one".