78739948501 has 2 divisors, whose sum is σ = 78739948502. Its totient is φ = 78739948500.

The previous prime is 78739948477. The next prime is 78739948513. The reversal of 78739948501 is 10584993787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52031891025 + 26708057476 = 228105^2 + 163426^2 .

It is an emirp because it is prime and its reverse (10584993787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78739948501 - 2²¹ = 78737851349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78739948501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78739948601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39369974250 + 39369974251.

It is an arithmetic number, because the mean of its divisors is an integer number (39369974251).

Almost surely, 2^78739948501 is an apocalyptic number.

It is an amenable number.

78739948501 is a deficient number, since it is larger than the sum of its proper divisors (1).

78739948501 is an equidigital number, since it uses as much as digits as its factorization.

78739948501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15240960, while the sum is 61.

The spelling of 78739948501 in words is "seventy-eight billion, seven hundred thirty-nine million, nine hundred forty-eight thousand, five hundred one".