115651220015 has 4 divisors (see below), whose sum is σ = 138781464024. Its totient is φ = 92520976008.

The previous prime is 115651220011. The next prime is 115651220029. The reversal of 115651220015 is 510022156511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 115651220015 - 2² = 115651220011 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 115651220015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115651220011) 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, 11565121997 + ... + 11565122006.

It is an arithmetic number, because the mean of its divisors is an integer number (34695366006).

Almost surely, 2^115651220015 is an apocalyptic number.

115651220015 is a deficient number, since it is larger than the sum of its proper divisors (23130244009).

115651220015 is an equidigital number, since it uses as much as digits as its factorization.

115651220015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23130244008.

The product of its (nonzero) digits is 3000, while the sum is 29.

Adding to 115651220015 its reverse (510022156511), we get a palindrome (625673376526).

The spelling of 115651220015 in words is "one hundred fifteen billion, six hundred fifty-one million, two hundred twenty thousand, fifteen".