77818801 has 2 divisors, whose sum is σ = 77818802. Its totient is φ = 77818800.

The previous prime is 77818799. The next prime is 77818831. The reversal of 77818801 is 10881877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73977201 + 3841600 = 8601^2 + 1960^2 .

It is an emirp because it is prime and its reverse (10881877) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77818801 - 2¹ = 77818799 is a prime.

Together with 77818799, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (77818831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38909400 + 38909401.

It is an arithmetic number, because the mean of its divisors is an integer number (38909401).

Almost surely, 2^77818801 is an apocalyptic number.

It is an amenable number.

77818801 is a deficient number, since it is larger than the sum of its proper divisors (1).

77818801 is an equidigital number, since it uses as much as digits as its factorization.

77818801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25088, while the sum is 40.

The square root of 77818801 is about 8821.4965283675. The cubic root of 77818801 is about 426.9347563057.

The spelling of 77818801 in words is "seventy-seven million, eight hundred eighteen thousand, eight hundred one".