66546537 has 4 divisors (see below), whose sum is σ = 88728720. Its totient is φ = 44364356.

The previous prime is 66546533. The next prime is 66546539. The reversal of 66546537 is 73564566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66546537 - 2² = 66546533 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66546533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11091087 + ... + 11091092.

It is an arithmetic number, because the mean of its divisors is an integer number (22182180).

Almost surely, 2^66546537 is an apocalyptic number.

It is an amenable number.

66546537 is a deficient number, since it is larger than the sum of its proper divisors (22182183).

66546537 is a wasteful number, since it uses less digits than its factorization.

66546537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22182182.

The product of its digits is 453600, while the sum is 42.

The square root of 66546537 is about 8157.6060826691. The cubic root of 66546537 is about 405.2364356370.

The spelling of 66546537 in words is "sixty-six million, five hundred forty-six thousand, five hundred thirty-seven".