78192604781 has 2 divisors, whose sum is σ = 78192604782. Its totient is φ = 78192604780.

The previous prime is 78192604733. The next prime is 78192604799. The reversal of 78192604781 is 18740629187.

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., 75153287881 + 3039316900 = 274141^2 + 55130^2 .

It is a cyclic number.

It is not a de Polignac number, because 78192604781 - 2²² = 78188410477 is a prime.

It is a super-2 number, since 2×78192604781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78192604081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39096302390 + 39096302391.

It is an arithmetic number, because the mean of its divisors is an integer number (39096302391).

Almost surely, 2^78192604781 is an apocalyptic number.

It is an amenable number.

78192604781 is a deficient number, since it is larger than the sum of its proper divisors (1).

78192604781 is an equidigital number, since it uses as much as digits as its factorization.

78192604781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1354752, while the sum is 53.

The spelling of 78192604781 in words is "seventy-eight billion, one hundred ninety-two million, six hundred four thousand, seven hundred eighty-one".