78195181457 has 8 divisors (see below), whose sum is σ = 78963830400. Its totient is φ = 77426714880.

The previous prime is 78195181453. The next prime is 78195181529. The reversal of 78195181457 is 75418159187.

It is a happy number.

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 78195181457 - 2² = 78195181453 is a prime.

It is a super-4 number, since 4×78195181457⁴ (a number of 45 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78195181451) 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, 915044 + ... + 996842.

It is an arithmetic number, because the mean of its divisors is an integer number (9870478800).

Almost surely, 2^78195181457 is an apocalyptic number.

It is an amenable number.

78195181457 is a deficient number, since it is larger than the sum of its proper divisors (768648943).

78195181457 is a wasteful number, since it uses less digits than its factorization.

78195181457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91183.

The product of its digits is 2822400, while the sum is 56.

The spelling of 78195181457 in words is "seventy-eight billion, one hundred ninety-five million, one hundred eighty-one thousand, four hundred fifty-seven".