7851311205345 has 48 divisors (see below), whose sum is σ = 13691160205632. Its totient is φ = 4162079859840.

The previous prime is 7851311205337. The next prime is 7851311205377. The reversal of 7851311205345 is 5435021131587.

7851311205345 is a `hidden beast` number, since 7 + 8 + 513 + 1 + 120 + 5 + 3 + 4 + 5 = 666.

It is not a de Polignac number, because 7851311205345 - 2³ = 7851311205337 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 7851311205345.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 30286930 + ... + 30545060.

It is an arithmetic number, because the mean of its divisors is an integer number (285232504284).

Almost surely, 2^{7851311205345} is an apocalyptic number.

It is an amenable number.

7851311205345 is a deficient number, since it is larger than the sum of its proper divisors (5839849000287).

7851311205345 is a wasteful number, since it uses less digits than its factorization.

7851311205345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262222 (or 262219 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 45.

The spelling of 7851311205345 in words is "seven trillion, eight hundred fifty-one billion, three hundred eleven million, two hundred five thousand, three hundred forty-five".