78485551511 has 4 divisors (see below), whose sum is σ = 78487835472. Its totient is φ = 78483267552.

The previous prime is 78485551471. The next prime is 78485551523. The reversal of 78485551511 is 11515558487.

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

It is a cyclic number.

It is not a de Polignac number, because 78485551511 - 2¹⁰ = 78485550487 is a prime.

It is a super-3 number, since 3×78485551511³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78485551511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78485551811) 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, 1089635 + ... + 1159428.

It is an arithmetic number, because the mean of its divisors is an integer number (19621958868).

Almost surely, 2^78485551511 is an apocalyptic number.

78485551511 is a deficient number, since it is larger than the sum of its proper divisors (2283961).

78485551511 is a wasteful number, since it uses less digits than its factorization.

78485551511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2283960.

The product of its digits is 1120000, while the sum is 50.

The spelling of 78485551511 in words is "seventy-eight billion, four hundred eighty-five million, five hundred fifty-one thousand, five hundred eleven".