78285124112721 has 16 divisors (see below), whose sum is σ = 104735260027008. Its totient is φ = 52012597865600.

The previous prime is 78285124112623. The next prime is 78285124112761. The reversal of 78285124112721 is 12721142158287.

It is a cyclic number.

It is not a de Polignac number, because 78285124112721 - 2¹⁴ = 78285124096337 is a prime.

It is a super-2 number, since 2×78285124112721² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78285124112761) 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, 2776116 + ... + 12817061.

It is an arithmetic number, because the mean of its divisors is an integer number (6545953751688).

Almost surely, 2^{78285124112721} is an apocalyptic number.

It is an amenable number.

78285124112721 is a deficient number, since it is larger than the sum of its proper divisors (26450135914287).

78285124112721 is a wasteful number, since it uses less digits than its factorization.

78285124112721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15598872.

The product of its digits is 1003520, while the sum is 51.

The spelling of 78285124112721 in words is "seventy-eight trillion, two hundred eighty-five billion, one hundred twenty-four million, one hundred twelve thousand, seven hundred twenty-one".