78855465603511 has 2 divisors, whose sum is σ = 78855465603512. Its totient is φ = 78855465603510.

The previous prime is 78855465603487. The next prime is 78855465603647. The reversal of 78855465603511 is 11530656455887.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78855465603511 - 2²¹ = 78855463506359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78855405603511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39427732801755 + 39427732801756.

It is an arithmetic number, because the mean of its divisors is an integer number (39427732801756).

Almost surely, 2^{78855465603511} is an apocalyptic number.

78855465603511 is a deficient number, since it is larger than the sum of its proper divisors (1).

78855465603511 is an equidigital number, since it uses as much as digits as its factorization.

78855465603511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960000, while the sum is 64.

The spelling of 78855465603511 in words is "seventy-eight trillion, eight hundred fifty-five billion, four hundred sixty-five million, six hundred three thousand, five hundred eleven".