66315237505 has 16 divisors (see below), whose sum is σ = 87024960000. Its totient is φ = 48111327360.

The previous prime is 66315237493. The next prime is 66315237509. The reversal of 66315237505 is 50573251366.

It is a happy number.

It is not a de Polignac number, because 66315237505 - 2²¹ = 66313140353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66315237509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1451505 + ... + 1496494.

It is an arithmetic number, because the mean of its divisors is an integer number (5439060000).

Almost surely, 2^66315237505 is an apocalyptic number.

It is an amenable number.

66315237505 is a deficient number, since it is larger than the sum of its proper divisors (20709722495).

66315237505 is a wasteful number, since it uses less digits than its factorization.

66315237505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2948424.

The product of its (nonzero) digits is 567000, while the sum is 43.

The spelling of 66315237505 in words is "sixty-six billion, three hundred fifteen million, two hundred thirty-seven thousand, five hundred five".