66058637561 has 16 divisors (see below), whose sum is σ = 75799825920. Its totient is φ = 56393937600.

The previous prime is 66058637551. The next prime is 66058637563. The reversal of 66058637561 is 16573685066.

It is not a de Polignac number, because 66058637561 - 2¹⁴ = 66058621177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66058637563) 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, 1891520 + ... + 1926126.

It is an arithmetic number, because the mean of its divisors is an integer number (4737489120).

Almost surely, 2^66058637561 is an apocalyptic number.

It is an amenable number.

66058637561 is a deficient number, since it is larger than the sum of its proper divisors (9741188359).

66058637561 is a wasteful number, since it uses less digits than its factorization.

66058637561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35704.

The product of its (nonzero) digits is 5443200, while the sum is 53.

The spelling of 66058637561 in words is "sixty-six billion, fifty-eight million, six hundred thirty-seven thousand, five hundred sixty-one".