66222640356015 has 48 divisors (see below), whose sum is σ = 125163996370560. Its totient is φ = 29638104762240.

The previous prime is 66222640356013. The next prime is 66222640356017. The reversal of 66222640356015 is 51065304622266.

It is an interprime number because it is at equal distance from previous prime (66222640356013) and next prime (66222640356017).

It is not a de Polignac number, because 66222640356015 - 2¹ = 66222640356013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66222640356013) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1187396185 + ... + 1187451954.

It is an arithmetic number, because the mean of its divisors is an integer number (2607583257720).

Almost surely, 2^{66222640356015} is an apocalyptic number.

66222640356015 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66222640356015 is a deficient number, since it is larger than the sum of its proper divisors (58941356014545).

66222640356015 is a wasteful number, since it uses less digits than its factorization.

66222640356015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2374848184 (or 2374848171 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 48.

The spelling of 66222640356015 in words is "sixty-six trillion, two hundred twenty-two billion, six hundred forty million, three hundred fifty-six thousand, fifteen".