78256495985 has 8 divisors (see below), whose sum is σ = 93917293800. Its totient is φ = 62598864384.

The previous prime is 78256495951. The next prime is 78256495987. The reversal of 78256495985 is 58959465287.

It can be written as a sum of positive squares in 4 ways, for example, as 1681984144 + 76574511841 = 41012^2 + 276721^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78256495985 - 2¹⁶ = 78256430449 is a prime.

It is a super-2 number, since 2×78256495985² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78256495987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 736832 + ... + 836321.

It is an arithmetic number, because the mean of its divisors is an integer number (11739661725).

Almost surely, 2^78256495985 is an apocalyptic number.

It is an amenable number.

78256495985 is a deficient number, since it is larger than the sum of its proper divisors (15660797815).

78256495985 is a wasteful number, since it uses less digits than its factorization.

78256495985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583107.

The product of its digits is 217728000, while the sum is 68.

The spelling of 78256495985 in words is "seventy-eight billion, two hundred fifty-six million, four hundred ninety-five thousand, nine hundred eighty-five".