66653137 has 4 divisors (see below), whose sum is σ = 66709300. Its totient is φ = 66596976.

The previous prime is 66653123. The next prime is 66653143. The reversal of 66653137 is 73135666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10042561 + 56610576 = 3169^2 + 7524^2 .

It is a cyclic number.

It is not a de Polignac number, because 66653137 - 2¹¹ = 66651089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66653096 and 66653105.

It is not an unprimeable number, because it can be changed into a prime (66653117) 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, 26262 + ... + 28687.

It is an arithmetic number, because the mean of its divisors is an integer number (16677325).

Almost surely, 2^66653137 is an apocalyptic number.

It is an amenable number.

66653137 is a deficient number, since it is larger than the sum of its proper divisors (56163).

66653137 is a wasteful number, since it uses less digits than its factorization.

66653137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56162.

The product of its digits is 68040, while the sum is 37.

The square root of 66653137 is about 8164.1372477439. The cubic root of 66653137 is about 405.4527011272.

The spelling of 66653137 in words is "sixty-six million, six hundred fifty-three thousand, one hundred thirty-seven".