78414664337561 has 8 divisors (see below), whose sum is σ = 80327362812648. Its totient is φ = 76501972800000.

The previous prime is 78414664337501. The next prime is 78414664337563. The reversal of 78414664337561 is 16573346641487.

It can be written as a sum of positive squares in 4 ways, for example, as 4982515944025 + 73432148393536 = 2232155^2 + 8569256^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78414664337561 - 2⁶ = 78414664337497 is a prime.

It is a super-2 number, since 2×78414664337561² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78414664337563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26806061 + ... + 29587061.

It is an arithmetic number, because the mean of its divisors is an integer number (10040920351581).

Almost surely, 2^{78414664337561} is an apocalyptic number.

It is an amenable number.

78414664337561 is a deficient number, since it is larger than the sum of its proper divisors (1912698475087).

78414664337561 is a wasteful number, since it uses less digits than its factorization.

78414664337561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3468763.

The product of its digits is 243855360, while the sum is 65.

The spelling of 78414664337561 in words is "seventy-eight trillion, four hundred fourteen billion, six hundred sixty-four million, three hundred thirty-seven thousand, five hundred sixty-one".