66151684061 has 16 divisors (see below), whose sum is σ = 72744343920. Its totient is φ = 59896995840.

The previous prime is 66151683991. The next prime is 66151684063. The reversal of 66151684061 is 16048615166.

It can be written as a sum of positive squares in 8 ways, for example, as 9033552025 + 57118132036 = 95045^2 + 238994^2 .

It is a cyclic number.

It is not a de Polignac number, because 66151684061 - 2²² = 66147489757 is a prime.

It is a super-2 number, since 2×66151684061² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66151684063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 534860 + ... + 646821.

It is an arithmetic number, because the mean of its divisors is an integer number (4546521495).

Almost surely, 2^66151684061 is an apocalyptic number.

It is an amenable number.

66151684061 is a deficient number, since it is larger than the sum of its proper divisors (6592659859).

66151684061 is a wasteful number, since it uses less digits than its factorization.

66151684061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181824.

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 66151684061 in words is "sixty-six billion, one hundred fifty-one million, six hundred eighty-four thousand, sixty-one".