78261138033 has 24 divisors (see below), whose sum is σ = 113033460672. Its totient is φ = 48143204928.

The previous prime is 78261137989. The next prime is 78261138049. The reversal of 78261138033 is 33083116287.

It is not a de Polignac number, because 78261138033 - 2¹⁶ = 78261072497 is a prime.

It is a super-2 number, since 2×78261138033² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78261138083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1445235 + ... + 1498407.

It is an arithmetic number, because the mean of its divisors is an integer number (4709727528).

Almost surely, 2^78261138033 is an apocalyptic number.

It is an amenable number.

78261138033 is a deficient number, since it is larger than the sum of its proper divisors (34772322639).

78261138033 is a wasteful number, since it uses less digits than its factorization.

78261138033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56105 (or 56092 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 78261138033 in words is "seventy-eight billion, two hundred sixty-one million, one hundred thirty-eight thousand, thirty-three".