78780554430399 has 64 divisors (see below), whose sum is σ = 125006393920000. Its totient is φ = 48886488990720.

The previous prime is 78780554430397. The next prime is 78780554430439. The reversal of 78780554430399 is 99303445508787.

78780554430399 is a `hidden beast` number, since 7 + 8 + 7 + 8 + 0 + 554 + 4 + 30 + 39 + 9 = 666.

It is not a de Polignac number, because 78780554430399 - 2¹ = 78780554430397 is a prime.

It is a super-2 number, since 2×78780554430399² (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 (78780554430397) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26994927 + ... + 29770575.

It is an arithmetic number, because the mean of its divisors is an integer number (1953224905000).

Almost surely, 2^{78780554430399} is an apocalyptic number.

78780554430399 is a deficient number, since it is larger than the sum of its proper divisors (46225839489601).

78780554430399 is a wasteful number, since it uses less digits than its factorization.

78780554430399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2776645 (or 2776639 counting only the distinct ones).

The product of its (nonzero) digits is 914457600, while the sum is 72.

The spelling of 78780554430399 in words is "seventy-eight trillion, seven hundred eighty billion, five hundred fifty-four million, four hundred thirty thousand, three hundred ninety-nine".