66167612405 has 8 divisors (see below), whose sum is σ = 81337748184. Its totient is φ = 51643014400.

The previous prime is 66167612393. The next prime is 66167612411. The reversal of 66167612405 is 50421676166.

It can be written as a sum of positive squares in 4 ways, for example, as 2361862801 + 63805749604 = 48599^2 + 252598^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66167612405 - 2⁴ = 66167612389 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 7 ways as a sum of consecutive naturals, for example, 161384216 + ... + 161384625.

It is an arithmetic number, because the mean of its divisors is an integer number (10167218523).

Almost surely, 2^66167612405 is an apocalyptic number.

It is an amenable number.

66167612405 is a deficient number, since it is larger than the sum of its proper divisors (15170135779).

66167612405 is a wasteful number, since it uses less digits than its factorization.

66167612405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322768887.

The product of its (nonzero) digits is 362880, while the sum is 44.

It can be divided in two parts, 6616761 and 2405, that added together give a palindrome (6619166).

The spelling of 66167612405 in words is "sixty-six billion, one hundred sixty-seven million, six hundred twelve thousand, four hundred five".