67145300721565 has 16 divisors (see below), whose sum is σ = 88438562300736. Its totient is φ = 48533357347200.

The previous prime is 67145300721559. The next prime is 67145300721593. The reversal of 67145300721565 is 56512700354176.

It is not a de Polignac number, because 67145300721565 - 2¹¹ = 67145300719517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3744848856 + ... + 3744866785.

It is an arithmetic number, because the mean of its divisors is an integer number (5527410143796).

Almost surely, 2^{67145300721565} is an apocalyptic number.

It is an amenable number.

67145300721565 is a deficient number, since it is larger than the sum of its proper divisors (21293261579171).

67145300721565 is a wasteful number, since it uses less digits than its factorization.

67145300721565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7489715820.

The product of its (nonzero) digits is 5292000, while the sum is 52.

The spelling of 67145300721565 in words is "sixty-seven trillion, one hundred forty-five billion, three hundred million, seven hundred twenty-one thousand, five hundred sixty-five".