78159944041 has 3 divisors (see below), whose sum is σ = 78160223613. Its totient is φ = 78159664470.

The previous prime is 78159944033. The next prime is 78159944047. The reversal of 78159944041 is 14044995187.

The square root of 78159944041 is 279571.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 78159944041 - 2³ = 78159944033 is a prime.

It is a super-2 number, since 2×78159944041² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78159944041.

It is not an unprimeable number, because it can be changed into a prime (78159944047) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 139786 + ... + 419356.

It is an arithmetic number, because the mean of its divisors is an integer number (26053407871).

Almost surely, 2^78159944041 is an apocalyptic number.

78159944041 is the 279571-st square number.

78159944041 is the 139786-th centered octagonal number.

It is an amenable number.

78159944041 is a deficient number, since it is larger than the sum of its proper divisors (279572).

78159944041 is an frugal number, since it uses more digits than its factorization.

78159944041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559142 (or 279571 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 52.

The spelling of 78159944041 in words is "seventy-eight billion, one hundred fifty-nine million, nine hundred forty-four thousand, forty-one".