7725970145 has 4 divisors (see below), whose sum is σ = 9271164180. Its totient is φ = 6180776112.

The previous prime is 7725970139. The next prime is 7725970159. The reversal of 7725970145 is 5410795277.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5410795277 = 4283 ⋅1263319.

It can be written as a sum of positive squares in 2 ways, for example, as 3399356416 + 4326613729 = 58304^2 + 65777^2 .

It is a cyclic number.

It is not a de Polignac number, because 7725970145 - 2⁶ = 7725970081 is a prime.

It is a super-2 number, since 2×7725970145² (a number of 21 digits) contains 22 as substring.

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 7725970145.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 772597010 + ... + 772597019.

It is an arithmetic number, because the mean of its divisors is an integer number (2317791045).

Almost surely, 2^7725970145 is an apocalyptic number.

It is an amenable number.

7725970145 is a deficient number, since it is larger than the sum of its proper divisors (1545194035).

7725970145 is a wasteful number, since it uses less digits than its factorization.

7725970145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545194034.

The product of its (nonzero) digits is 617400, while the sum is 47.

The square root of 7725970145 is about 87897.4979450496. The cubic root of 7725970145 is about 1976.8983633599.

The spelling of 7725970145 in words is "seven billion, seven hundred twenty-five million, nine hundred seventy thousand, one hundred forty-five".