79785818045 has 16 divisors (see below), whose sum is σ = 99116431920. Its totient is φ = 61582886400.

The previous prime is 79785818017. The next prime is 79785818069. The reversal of 79785818045 is 54081858797.

It can be written as a sum of positive squares in 8 ways, for example, as 11163824281 + 68621993764 = 105659^2 + 261958^2 .

It is not a de Polignac number, because 79785818045 - 2⁸ = 79785817789 is a prime.

It is a super-2 number, since 2×79785818045² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1025 + ... + 399465.

It is an arithmetic number, because the mean of its divisors is an integer number (6194776995).

Almost surely, 2^79785818045 is an apocalyptic number.

It is an amenable number.

79785818045 is a deficient number, since it is larger than the sum of its proper divisors (19330613875).

79785818045 is a wasteful number, since it uses less digits than its factorization.

79785818045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399856.

The product of its (nonzero) digits is 22579200, while the sum is 62.

The spelling of 79785818045 in words is "seventy-nine billion, seven hundred eighty-five million, eight hundred eighteen thousand, forty-five".