78155455207 has 2 divisors, whose sum is σ = 78155455208. Its totient is φ = 78155455206.

The previous prime is 78155455127. The next prime is 78155455229. The reversal of 78155455207 is 70255455187.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78155455207 is a prime.

It is a super-2 number, since 2×78155455207² (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 (78155455507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39077727603 + 39077727604.

It is an arithmetic number, because the mean of its divisors is an integer number (39077727604).

Almost surely, 2^78155455207 is an apocalyptic number.

78155455207 is a deficient number, since it is larger than the sum of its proper divisors (1).

78155455207 is an equidigital number, since it uses as much as digits as its factorization.

78155455207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1960000, while the sum is 49.

The spelling of 78155455207 in words is "seventy-eight billion, one hundred fifty-five million, four hundred fifty-five thousand, two hundred seven".