78739955351 has 2 divisors, whose sum is σ = 78739955352. Its totient is φ = 78739955350.

The previous prime is 78739955347. The next prime is 78739955369. The reversal of 78739955351 is 15355993787.

It is a weak prime.

It is an emirp because it is prime and its reverse (15355993787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78739955351 - 2² = 78739955347 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78739955321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39369977675 + 39369977676.

It is an arithmetic number, because the mean of its divisors is an integer number (39369977676).

Almost surely, 2^78739955351 is an apocalyptic number.

78739955351 is a deficient number, since it is larger than the sum of its proper divisors (1).

78739955351 is an equidigital number, since it uses as much as digits as its factorization.

78739955351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35721000, while the sum is 62.

The spelling of 78739955351 in words is "seventy-eight billion, seven hundred thirty-nine million, nine hundred fifty-five thousand, three hundred fifty-one".