78566121069 has 16 divisors (see below), whose sum is σ = 104975216640. Its totient is φ = 52267333680.

The previous prime is 78566121037. The next prime is 78566121071. The reversal of 78566121069 is 96012166587.

It is not a de Polignac number, because 78566121069 - 2⁵ = 78566121037 is a prime.

It is a super-2 number, since 2×78566121069² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78566121269) 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, 2959284 + ... + 2985714.

It is an arithmetic number, because the mean of its divisors is an integer number (6560951040).

Almost surely, 2^78566121069 is an apocalyptic number.

It is an amenable number.

78566121069 is a deficient number, since it is larger than the sum of its proper divisors (26409095571).

78566121069 is a wasteful number, since it uses less digits than its factorization.

78566121069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28480.

The product of its (nonzero) digits is 1088640, while the sum is 51.

The spelling of 78566121069 in words is "seventy-eight billion, five hundred sixty-six million, one hundred twenty-one thousand, sixty-nine".