7255221515 has 8 divisors (see below), whose sum is σ = 8740953648. Its totient is φ = 5781052000.

The previous prime is 7255221511. The next prime is 7255221541. The reversal of 7255221515 is 5151225527.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7255221515 - 2² = 7255221511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7255221511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2889272 + ... + 2891781.

It is an arithmetic number, because the mean of its divisors is an integer number (1092619206).

Almost surely, 2^7255221515 is an apocalyptic number.

7255221515 is a deficient number, since it is larger than the sum of its proper divisors (1485732133).

7255221515 is a wasteful number, since it uses less digits than its factorization.

7255221515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5781309.

The product of its digits is 35000, while the sum is 35.

The square root of 7255221515 is about 85177.5881027398. The cubic root of 7255221515 is about 1935.9028488227.

The spelling of 7255221515 in words is "seven billion, two hundred fifty-five million, two hundred twenty-one thousand, five hundred fifteen".