78211538481 has 16 divisors (see below), whose sum is σ = 104448553920. Its totient is φ = 52057824000.

The previous prime is 78211538417. The next prime is 78211538501. The reversal of 78211538481 is 18483511287.

It is not a de Polignac number, because 78211538481 - 2⁶ = 78211538417 is a prime.

It is a super-2 number, since 2×78211538481² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78211538481.

It is not an unprimeable number, because it can be changed into a prime (78211538411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11167981 + ... + 11174981.

It is an arithmetic number, because the mean of its divisors is an integer number (6528034620).

Almost surely, 2^78211538481 is an apocalyptic number.

It is an amenable number.

78211538481 is a deficient number, since it is larger than the sum of its proper divisors (26237015439).

78211538481 is a wasteful number, since it uses less digits than its factorization.

78211538481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12416.

The product of its digits is 430080, while the sum is 48.

The spelling of 78211538481 in words is "seventy-eight billion, two hundred eleven million, five hundred thirty-eight thousand, four hundred eighty-one".