66607012071515 has 4 divisors (see below), whose sum is σ = 79928414485824. Its totient is φ = 53285609657208.

The previous prime is 66607012071451. The next prime is 66607012071571. The reversal of 66607012071515 is 51517021070666.

It is a happy number.

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 66607012071515 - 2⁶ = 66607012071451 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 66607012071515.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6660701207147 + ... + 6660701207156.

It is an arithmetic number, because the mean of its divisors is an integer number (19982103621456).

Almost surely, 2^{66607012071515} is an apocalyptic number.

66607012071515 is a deficient number, since it is larger than the sum of its proper divisors (13321402414309).

66607012071515 is a wasteful number, since it uses less digits than its factorization.

66607012071515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13321402414308.

The product of its (nonzero) digits is 529200, while the sum is 47.

The spelling of 66607012071515 in words is "sixty-six trillion, six hundred seven billion, twelve million, seventy-one thousand, five hundred fifteen".