66170072051511 has 32 divisors (see below), whose sum is σ = 88614769763520. Its totient is φ = 43919912678400.

The previous prime is 66170072051491. The next prime is 66170072051617. The reversal of 66170072051511 is 11515027007166.

It is not a de Polignac number, because 66170072051511 - 2¹⁴ = 66170072035127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66170077051511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1150174995 + ... + 1150232523.

It is an arithmetic number, because the mean of its divisors is an integer number (2769211555110).

Almost surely, 2^{66170072051511} is an apocalyptic number.

66170072051511 is a deficient number, since it is larger than the sum of its proper divisors (22444697712009).

66170072051511 is a wasteful number, since it uses less digits than its factorization.

66170072051511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59827.

The product of its (nonzero) digits is 88200, while the sum is 42.

Adding to 66170072051511 its reverse (11515027007166), we get a palindrome (77685099058677).

The spelling of 66170072051511 in words is "sixty-six trillion, one hundred seventy billion, seventy-two million, fifty-one thousand, five hundred eleven".