78145548338761 has 4 divisors (see below), whose sum is σ = 78145577584000. Its totient is φ = 78145519093524.

The previous prime is 78145548338747. The next prime is 78145548338783. The reversal of 78145548338761 is 16783384554187.

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 78145548338761 - 2⁷ = 78145548338633 is a prime.

It is a super-2 number, since 2×78145548338761² (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 (78145548338701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10160661 + ... + 16109938.

It is an arithmetic number, because the mean of its divisors is an integer number (19536394396000).

Almost surely, 2^{78145548338761} is an apocalyptic number.

It is an amenable number.

78145548338761 is a deficient number, since it is larger than the sum of its proper divisors (29245239).

78145548338761 is a wasteful number, since it uses less digits than its factorization.

78145548338761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29245238.

The product of its digits is 541900800, while the sum is 70.

The spelling of 78145548338761 in words is "seventy-eight trillion, one hundred forty-five billion, five hundred forty-eight million, three hundred thirty-eight thousand, seven hundred sixty-one".