7845136261 has 4 divisors (see below), whose sum is σ = 7847370412. Its totient is φ = 7842902112.

The previous prime is 7845136259. The next prime is 7845136363. The reversal of 7845136261 is 1626315487.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4674320161 + 3170816100 = 68369^2 + 56310^2 .

It is a cyclic number.

It is not a de Polignac number, because 7845136261 - 2¹ = 7845136259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7845130261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1111800 + ... + 1118833.

It is an arithmetic number, because the mean of its divisors is an integer number (1961842603).

Almost surely, 2^7845136261 is an apocalyptic number.

It is an amenable number.

7845136261 is a deficient number, since it is larger than the sum of its proper divisors (2234151).

7845136261 is a wasteful number, since it uses less digits than its factorization.

7845136261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2234150.

The product of its digits is 241920, while the sum is 43.

The square root of 7845136261 is about 88572.7738134016. The cubic root of 7845136261 is about 1987.0105076000.

The spelling of 7845136261 in words is "seven billion, eight hundred forty-five million, one hundred thirty-six thousand, two hundred sixty-one".