78324109210557 has 48 divisors (see below), whose sum is σ = 131441710985728. Its totient is φ = 44014494666240.

The previous prime is 78324109210547. The next prime is 78324109210561. The reversal of 78324109210557 is 75501290142387.

78324109210557 is a `hidden beast` number, since 7 + 8 + 3 + 2 + 410 + 9 + 210 + 5 + 5 + 7 = 666.

It is not a de Polignac number, because 78324109210557 - 2²³ = 78324100821949 is a prime.

It is a super-2 number, since 2×78324109210557² (a number of 29 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 (78324109210547) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18163068 + ... + 22057770.

Almost surely, 2^{78324109210557} is an apocalyptic number.

It is an amenable number.

78324109210557 is a deficient number, since it is larger than the sum of its proper divisors (53117601775171).

78324109210557 is a wasteful number, since it uses less digits than its factorization.

78324109210557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3900010 (or 3900007 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 54.

The spelling of 78324109210557 in words is "seventy-eight trillion, three hundred twenty-four billion, one hundred nine million, two hundred ten thousand, five hundred fifty-seven".