78117201257 has 8 divisors (see below), whose sum is σ = 79937642400. Its totient is φ = 76296931200.

The previous prime is 78117201251. The next prime is 78117201301. The reversal of 78117201257 is 75210271187.

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 78117201257 - 2⁶ = 78117201193 is a prime.

It is a super-2 number, since 2×78117201257² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78117201251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1673369 + ... + 1719417.

It is an arithmetic number, because the mean of its divisors is an integer number (9992205300).

Almost surely, 2^78117201257 is an apocalyptic number.

It is an amenable number.

78117201257 is a deficient number, since it is larger than the sum of its proper divisors (1820441143).

78117201257 is a wasteful number, since it uses less digits than its factorization.

78117201257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85543.

The product of its (nonzero) digits is 54880, while the sum is 41.

The spelling of 78117201257 in words is "seventy-eight billion, one hundred seventeen million, two hundred one thousand, two hundred fifty-seven".