7125027661 has 4 divisors (see below), whose sum is σ = 7370718300. Its totient is φ = 6879337024.

The previous prime is 7125027643. The next prime is 7125027667. The reversal of 7125027661 is 1667205217.

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 1122652036 + 6002375625 = 33506^2 + 77475^2 .

It is a cyclic number.

It is not a de Polignac number, because 7125027661 - 2¹¹ = 7125025613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7125027661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7125027667) 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, 122845276 + ... + 122845333.

It is an arithmetic number, because the mean of its divisors is an integer number (1842679575).

Almost surely, 2^7125027661 is an apocalyptic number.

It is an amenable number.

7125027661 is a deficient number, since it is larger than the sum of its proper divisors (245690639).

7125027661 is a wasteful number, since it uses less digits than its factorization.

7125027661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245690638.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 7125027661 is about 84409.8789301347. The cubic root of 7125027661 is about 1924.2530557730.

The spelling of 7125027661 in words is "seven billion, one hundred twenty-five million, twenty-seven thousand, six hundred sixty-one".