78257830529985 has 16 divisors (see below), whose sum is σ = 125310122432064. Its totient is φ = 41704978421312.

The previous prime is 78257830529971. The next prime is 78257830530031. The reversal of 78257830529985 is 58992503875287.

It is a cyclic number.

It is not a de Polignac number, because 78257830529985 - 2¹⁶ = 78257830464449 is a prime.

It is a super-2 number, since 2×78257830529985² (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 78257830529985.

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, 2033179782 + ... + 2033218271.

It is an arithmetic number, because the mean of its divisors is an integer number (7831882652004).

Almost surely, 2^{78257830529985} is an apocalyptic number.

It is an amenable number.

78257830529985 is a deficient number, since it is larger than the sum of its proper divisors (47052291902079).

78257830529985 is a wasteful number, since it uses less digits than its factorization.

78257830529985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4066399344.

The product of its (nonzero) digits is 3048192000, while the sum is 78.

The spelling of 78257830529985 in words is "seventy-eight trillion, two hundred fifty-seven billion, eight hundred thirty million, five hundred twenty-nine thousand, nine hundred eighty-five".