78280663577885 has 16 divisors (see below), whose sum is σ = 95278359825792. Its totient is φ = 61730497953600.

The previous prime is 78280663577873. The next prime is 78280663577927. The reversal of 78280663577885 is 58877536608287.

It is not a de Polignac number, because 78280663577885 - 2¹² = 78280663573789 is a prime.

It is a super-2 number, since 2×78280663577885² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19593926 + ... + 23248295.

It is an arithmetic number, because the mean of its divisors is an integer number (5954897489112).

Almost surely, 2^{78280663577885} is an apocalyptic number.

It is an amenable number.

78280663577885 is a deficient number, since it is larger than the sum of its proper divisors (16997696247907).

78280663577885 is a wasteful number, since it uses less digits than its factorization.

78280663577885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42847444.

The product of its (nonzero) digits is 7586611200, while the sum is 80.

The spelling of 78280663577885 in words is "seventy-eight trillion, two hundred eighty billion, six hundred sixty-three million, five hundred seventy-seven thousand, eight hundred eighty-five".