78242576408261 has 4 divisors (see below), whose sum is σ = 78287057692800. Its totient is φ = 78198095123724.

The previous prime is 78242576408257. The next prime is 78242576408333. The reversal of 78242576408261 is 16280467524287.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78242576408261 - 2² = 78242576408257 is a prime.

It is a super-2 number, since 2×78242576408261² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78242576408194 and 78242576408203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78242576408561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22240639631 + ... + 22240643148.

It is an arithmetic number, because the mean of its divisors is an integer number (19571764423200).

Almost surely, 2^{78242576408261} is an apocalyptic number.

It is an amenable number.

78242576408261 is a deficient number, since it is larger than the sum of its proper divisors (44481284539).

78242576408261 is a wasteful number, since it uses less digits than its factorization.

78242576408261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44481284538.

The product of its (nonzero) digits is 72253440, while the sum is 62.

The spelling of 78242576408261 in words is "seventy-eight trillion, two hundred forty-two billion, five hundred seventy-six million, four hundred eight thousand, two hundred sixty-one".