7951212765 has 24 divisors (see below), whose sum is σ = 13795524600. Its totient is φ = 4236516864.

The previous prime is 7951212761. The next prime is 7951212767. The reversal of 7951212765 is 5672121597.

7951212765 is a `hidden beast` number, since 7 + 9 + 512 + 127 + 6 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 734030649 + 7217182116 = 27093^2 + 84954^2 .

It is not a de Polignac number, because 7951212765 - 2² = 7951212761 is a prime.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7951212765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7951212761) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39040 + ... + 132009.

It is an arithmetic number, because the mean of its divisors is an integer number (574813525).

Almost surely, 2^7951212765 is an apocalyptic number.

It is an amenable number.

7951212765 is a deficient number, since it is larger than the sum of its proper divisors (5844311835).

7951212765 is a wasteful number, since it uses less digits than its factorization.

7951212765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172093 (or 172090 counting only the distinct ones).

The product of its digits is 264600, while the sum is 45.

The square root of 7951212765 is about 89169.5730897036. The cubic root of 7951212765 is about 1995.9261044051.

The spelling of 7951212765 in words is "seven billion, nine hundred fifty-one million, two hundred twelve thousand, seven hundred sixty-five".