78218451363573 has 24 divisors (see below), whose sum is σ = 113101243819200. Its totient is φ = 52090704388800.

The previous prime is 78218451363527. The next prime is 78218451363601. The reversal of 78218451363573 is 37536315481287.

78218451363573 is a `hidden beast` number, since 7 + 8 + 2 + 1 + 8 + 4 + 51 + 3 + 6 + 3 + 573 = 666.

It is not a de Polignac number, because 78218451363573 - 2⁶ = 78218451363509 is a prime.

It is a super-2 number, since 2×78218451363573² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78218451363573.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78218451365573) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94972398 + ... + 95792448.

It is an arithmetic number, because the mean of its divisors is an integer number (4712551825800).

Almost surely, 2^{78218451363573} is an apocalyptic number.

It is an amenable number.

78218451363573 is a deficient number, since it is larger than the sum of its proper divisors (34882792455627).

78218451363573 is a wasteful number, since it uses less digits than its factorization.

78218451363573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831209 (or 831206 counting only the distinct ones).

The product of its digits is 101606400, while the sum is 63.

The spelling of 78218451363573 in words is "seventy-eight trillion, two hundred eighteen billion, four hundred fifty-one million, three hundred sixty-three thousand, five hundred seventy-three".