78148170063821 has 32 divisors (see below), whose sum is σ = 94273019043840. Its totient is φ = 63841479883200.

The previous prime is 78148170063797. The next prime is 78148170063827. The reversal of 78148170063821 is 12836007184187.

It is a cyclic number.

It is not a de Polignac number, because 78148170063821 - 2¹⁰ = 78148170062797 is a prime.

It is a super-2 number, since 2×78148170063821² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78148170063827) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44094845 + ... + 45832866.

It is an arithmetic number, because the mean of its divisors is an integer number (2946031845120).

Almost surely, 2^{78148170063821} is an apocalyptic number.

It is an amenable number.

78148170063821 is a deficient number, since it is larger than the sum of its proper divisors (16124848980019).

78148170063821 is a wasteful number, since it uses less digits than its factorization.

78148170063821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89927897.

The product of its (nonzero) digits is 3612672, while the sum is 56.

The spelling of 78148170063821 in words is "seventy-eight trillion, one hundred forty-eight billion, one hundred seventy million, sixty-three thousand, eight hundred twenty-one".