2515665251 has 8 divisors (see below), whose sum is σ = 2748447984. Its totient is φ = 2283563520.

The previous prime is 2515665247. The next prime is 2515665263. The reversal of 2515665251 is 1525665152.

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

It is a cyclic number.

It is not a de Polignac number, because 2515665251 - 2² = 2515665247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2515665211) 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, 162506 + ... + 177311.

It is an arithmetic number, because the mean of its divisors is an integer number (343555998).

Almost surely, 2^2515665251 is an apocalyptic number.

2515665251 is a deficient number, since it is larger than the sum of its proper divisors (232782733).

2515665251 is a wasteful number, since it uses less digits than its factorization.

2515665251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340501.

The product of its digits is 90000, while the sum is 38.

The square root of 2515665251 is about 50156.4078757640. The cubic root of 2515665251 is about 1360.0377099910.

Subtracting from 2515665251 its reverse (1525665152), we obtain a palindrome (990000099).

It can be divided in two parts, 2515 and 665251, that added together give a palindrome (667766).

The spelling of 2515665251 in words is "two billion, five hundred fifteen million, six hundred sixty-five thousand, two hundred fifty-one".