78148974853 has 4 divisors (see below), whose sum is σ = 78181799148. Its totient is φ = 78116150560.

The previous prime is 78148974829. The next prime is 78148974887. The reversal of 78148974853 is 35847984187.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22470909409 + 55678065444 = 149903^2 + 235962^2 .

It is a cyclic number.

It is not a de Polignac number, because 78148974853 - 2⁹ = 78148974341 is a prime.

It is a super-2 number, since 2×78148974853² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78148974053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16408576 + ... + 16413337.

It is an arithmetic number, because the mean of its divisors is an integer number (19545449787).

Almost surely, 2^78148974853 is an apocalyptic number.

It is an amenable number.

78148974853 is a deficient number, since it is larger than the sum of its proper divisors (32824295).

78148974853 is a wasteful number, since it uses less digits than its factorization.

78148974853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32824294.

The product of its digits is 54190080, while the sum is 64.

The spelling of 78148974853 in words is "seventy-eight billion, one hundred forty-eight million, nine hundred seventy-four thousand, eight hundred fifty-three".