66140053 has 18 divisors (see below), whose sum is σ = 79433718. Its totient is φ = 54870480.

The previous prime is 66140033. The next prime is 66140069. The reversal of 66140053 is 35004166.

It can be written as a sum of positive squares in only one way, i.e., 64352484 + 1787569 = 8022^2 + 1337^2 .

It is not a de Polignac number, because 66140053 - 2¹⁷ = 66008981 is a prime.

It is a super-2 number, since 2×66140053² = 8749013221685618, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66140033) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 346188 + ... + 346378.

Almost surely, 2^66140053 is an apocalyptic number.

It is an amenable number.

66140053 is a deficient number, since it is larger than the sum of its proper divisors (13293665).

66140053 is an equidigital number, since it uses as much as digits as its factorization.

66140053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433 (or 235 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 66140053 is about 8132.6535030087. The cubic root of 66140053 is about 404.4096525244.

The spelling of 66140053 in words is "sixty-six million, one hundred forty thousand, fifty-three".