78154967609783 has 2 divisors, whose sum is σ = 78154967609784. Its totient is φ = 78154967609782.

The previous prime is 78154967609731. The next prime is 78154967609791. The reversal of 78154967609783 is 38790676945187.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78154967609783 - 2²² = 78154963415479 is a prime.

It is a super-2 number, since 2×78154967609783² (a number of 29 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 78154967609698 and 78154967609707.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78154967609723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39077483804891 + 39077483804892.

It is an arithmetic number, because the mean of its divisors is an integer number (39077483804892).

Almost surely, 2^{78154967609783} is an apocalyptic number.

78154967609783 is a deficient number, since it is larger than the sum of its proper divisors (1).

78154967609783 is an equidigital number, since it uses as much as digits as its factorization.

78154967609783 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840721920, while the sum is 80.

The spelling of 78154967609783 in words is "seventy-eight trillion, one hundred fifty-four billion, nine hundred sixty-seven million, six hundred nine thousand, seven hundred eighty-three".