78540124248861 has 12 divisors (see below), whose sum is σ = 115105636640736. Its totient is φ = 47600075302120.

The previous prime is 78540124248857. The next prime is 78540124248889. The reversal of 78540124248861 is 16884242104587.

It is not a de Polignac number, because 78540124248861 - 2² = 78540124248857 is a prime.

It is a super-2 number, since 2×78540124248861² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78540124248795 and 78540124248804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78540124248961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108181988961 + ... + 108181989686.

It is an arithmetic number, because the mean of its divisors is an integer number (9592136386728).

Almost surely, 2^{78540124248861} is an apocalyptic number.

It is an amenable number.

78540124248861 is a deficient number, since it is larger than the sum of its proper divisors (36565512391875).

78540124248861 is a wasteful number, since it uses less digits than its factorization.

78540124248861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216363978672 (or 216363978661 counting only the distinct ones).

The product of its (nonzero) digits is 27525120, while the sum is 60.

The spelling of 78540124248861 in words is "seventy-eight trillion, five hundred forty billion, one hundred twenty-four million, two hundred forty-eight thousand, eight hundred sixty-one".