78209240923535 has 16 divisors (see below), whose sum is σ = 94830483827520. Its totient is φ = 61915118822400.

The previous prime is 78209240923441. The next prime is 78209240923553. The reversal of 78209240923535 is 53532904290287.

It is not a de Polignac number, because 78209240923535 - 2³⁸ = 77934363016591 is a prime.

It is a super-2 number, since 2×78209240923535² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40038587 + ... + 41946476.

It is an arithmetic number, because the mean of its divisors is an integer number (5926905239220).

Almost surely, 2^{78209240923535} is an apocalyptic number.

78209240923535 is a deficient number, since it is larger than the sum of its proper divisors (16621242903985).

78209240923535 is a wasteful number, since it uses less digits than its factorization.

78209240923535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81987058.

The product of its (nonzero) digits is 32659200, while the sum is 59.

The spelling of 78209240923535 in words is "seventy-eight trillion, two hundred nine billion, two hundred forty million, nine hundred twenty-three thousand, five hundred thirty-five".