78181583583 has 4 divisors (see below), whose sum is σ = 104242111448. Its totient is φ = 52121055720.

The previous prime is 78181583567. The next prime is 78181583587. The reversal of 78181583583 is 38538518187.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 78181583583 - 2⁴ = 78181583567 is a prime.

It is a super-2 number, since 2×78181583583² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78181583587) 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, 13030263928 + ... + 13030263933.

It is an arithmetic number, because the mean of its divisors is an integer number (26060527862).

Almost surely, 2^78181583583 is an apocalyptic number.

78181583583 is a deficient number, since it is larger than the sum of its proper divisors (26060527865).

78181583583 is a wasteful number, since it uses less digits than its factorization.

78181583583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26060527864.

The product of its digits is 6451200, while the sum is 57.

The spelling of 78181583583 in words is "seventy-eight billion, one hundred eighty-one million, five hundred eighty-three thousand, five hundred eighty-three".