7123951250261 has 4 divisors (see below), whose sum is σ = 7123957749132. Its totient is φ = 7123944751392.

The previous prime is 7123951250197. The next prime is 7123951250303. The reversal of 7123951250261 is 1620521593217.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3452186296036 + 3671764954225 = 1858006^2 + 1916185^2 .

It is a cyclic number.

It is not a de Polignac number, because 7123951250261 - 2⁶ = 7123951250197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7123951250161) 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, 1155296 + ... + 3947481.

It is an arithmetic number, because the mean of its divisors is an integer number (1780989437283).

Almost surely, 2^{7123951250261} is an apocalyptic number.

It is an amenable number.

7123951250261 is a deficient number, since it is larger than the sum of its proper divisors (6498871).

7123951250261 is a wasteful number, since it uses less digits than its factorization.

7123951250261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6498870.

The product of its (nonzero) digits is 226800, while the sum is 44.

The spelling of 7123951250261 in words is "seven trillion, one hundred twenty-three billion, nine hundred fifty-one million, two hundred fifty thousand, two hundred sixty-one".