7255507861 has 6 divisors (see below), whose sum is σ = 8440080630. Its totient is φ = 6219006696.

The previous prime is 7255507793. The next prime is 7255507873. The reversal of 7255507861 is 1687055527.

It can be written as a sum of positive squares in only one way, i.e., 6631007761 + 624500100 = 81431^2 + 24990^2 .

It is not a de Polignac number, because 7255507861 - 2⁷ = 7255507733 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 (7255567861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 74035746 + ... + 74035843.

It is an arithmetic number, because the mean of its divisors is an integer number (1406680105).

Almost surely, 2^7255507861 is an apocalyptic number.

It is an amenable number.

7255507861 is a deficient number, since it is larger than the sum of its proper divisors (1184572769).

7255507861 is a wasteful number, since it uses less digits than its factorization.

7255507861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148071603 (or 148071596 counting only the distinct ones).

The product of its (nonzero) digits is 588000, while the sum is 46.

The square root of 7255507861 is about 85179.2689625827. The cubic root of 7255507861 is about 1935.9283169513.

The spelling of 7255507861 in words is "seven billion, two hundred fifty-five million, five hundred seven thousand, eight hundred sixty-one".