66252440215 has 8 divisors (see below), whose sum is σ = 85618538208. Its totient is φ = 48924878880.

The previous prime is 66252440153. The next prime is 66252440251. The reversal of 66252440215 is 51204425266.

It is a happy number.

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

It is not a de Polignac number, because 66252440215 - 2⁹ = 66252439703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 509634091 + ... + 509634220.

It is an arithmetic number, because the mean of its divisors is an integer number (10702317276).

Almost surely, 2^66252440215 is an apocalyptic number.

66252440215 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66252440215 is a deficient number, since it is larger than the sum of its proper divisors (19366097993).

66252440215 is a wasteful number, since it uses less digits than its factorization.

66252440215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019268329.

The product of its (nonzero) digits is 115200, while the sum is 37.

The spelling of 66252440215 in words is "sixty-six billion, two hundred fifty-two million, four hundred forty thousand, two hundred fifteen".