78282477517 has 4 divisors (see below), whose sum is σ = 81686063520. Its totient is φ = 74878891516.

The previous prime is 78282477499. The next prime is 78282477551. The reversal of 78282477517 is 71577428287.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78282477517 - 2²⁷ = 78148259789 is a prime.

It is a super-2 number, since 2×78282477517² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78282417517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1701792967 + ... + 1701793012.

It is an arithmetic number, because the mean of its divisors is an integer number (20421515880).

Almost surely, 2^78282477517 is an apocalyptic number.

It is an amenable number.

78282477517 is a deficient number, since it is larger than the sum of its proper divisors (3403586003).

78282477517 is a wasteful number, since it uses less digits than its factorization.

78282477517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3403586002.

The product of its digits is 12293120, while the sum is 58.

The spelling of 78282477517 in words is "seventy-eight billion, two hundred eighty-two million, four hundred seventy-seven thousand, five hundred seventeen".