78148539901 has 2 divisors, whose sum is σ = 78148539902. Its totient is φ = 78148539900.

The previous prime is 78148539899. The next prime is 78148539919. The reversal of 78148539901 is 10993584187.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73435580100 + 4712959801 = 270990^2 + 68651^2 .

It is a cyclic number.

It is not a de Polignac number, because 78148539901 - 2¹ = 78148539899 is a prime.

It is a super-2 number, since 2×78148539901² (a number of 23 digits) contains 22 as substring.

Together with 78148539899, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78148533901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39074269950 + 39074269951.

It is an arithmetic number, because the mean of its divisors is an integer number (39074269951).

Almost surely, 2^78148539901 is an apocalyptic number.

It is an amenable number.

78148539901 is a deficient number, since it is larger than the sum of its proper divisors (1).

78148539901 is an equidigital number, since it uses as much as digits as its factorization.

78148539901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2177280, while the sum is 55.

The spelling of 78148539901 in words is "seventy-eight billion, one hundred forty-eight million, five hundred thirty-nine thousand, nine hundred one".