78190339853 has 2 divisors, whose sum is σ = 78190339854. Its totient is φ = 78190339852.

The previous prime is 78190339847. The next prime is 78190339867. The reversal of 78190339853 is 35893309187.

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., 39775515844 + 38414824009 = 199438^2 + 195997^2 .

It is an emirp because it is prime and its reverse (35893309187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78190339853 - 2¹⁸ = 78190077709 is a prime.

It is a super-2 number, since 2×78190339853² (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 (78190339883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39095169926 + 39095169927.

It is an arithmetic number, because the mean of its divisors is an integer number (39095169927).

Almost surely, 2^78190339853 is an apocalyptic number.

It is an amenable number.

78190339853 is a deficient number, since it is larger than the sum of its proper divisors (1).

78190339853 is an equidigital number, since it uses as much as digits as its factorization.

78190339853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4898880, while the sum is 56.

The spelling of 78190339853 in words is "seventy-eight billion, one hundred ninety million, three hundred thirty-nine thousand, eight hundred fifty-three".