66159041796 has 81 divisors (see below), whose sum is σ = 168909867399. Its totient is φ = 21834382032.

The previous prime is 66159041783. The next prime is 66159041803. The reversal of 66159041796 is 69714095166.

It is a happy number.

The square root of 66159041796 is 257214.

It is a perfect power (a square), and thus also a powerful number.

66159041796 is a `hidden beast` number, since 6 + 6 + 1 + 590 + 41 + 7 + 9 + 6 = 666.

It is a super-2 number, since 2×66159041796² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 251555161 + ... + 251555423.

Almost surely, 2^66159041796 is an apocalyptic number.

66159041796 is the 257214-th square number.

It is an amenable number.

66159041796 is an abundant number, since it is smaller than the sum of its proper divisors (102750825603).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66159041796 is a wasteful number, since it uses less digits than its factorization.

66159041796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The spelling of 66159041796 in words is "sixty-six billion, one hundred fifty-nine million, forty-one thousand, seven hundred ninety-six".