77815849645 has 16 divisors (see below), whose sum is σ = 94675772160. Its totient is φ = 61390090944.

The previous prime is 77815849619. The next prime is 77815849651. The reversal of 77815849645 is 54694851877.

It is a cyclic number.

It is not a de Polignac number, because 77815849645 - 2¹¹ = 77815847597 is a prime.

It is a super-3 number, since 3×77815849645³ (a number of 34 digits) contains 333 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 (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207559 + ... + 445771.

It is an arithmetic number, because the mean of its divisors is an integer number (5917235760).

Almost surely, 2^77815849645 is an apocalyptic number.

It is an amenable number.

77815849645 is a deficient number, since it is larger than the sum of its proper divisors (16859922515).

77815849645 is a wasteful number, since it uses less digits than its factorization.

77815849645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239124.

The product of its digits is 67737600, while the sum is 64.

The spelling of 77815849645 in words is "seventy-seven billion, eight hundred fifteen million, eight hundred forty-nine thousand, six hundred forty-five".