66142253 has 4 divisors (see below), whose sum is σ = 66304380. Its totient is φ = 65980128.

The previous prime is 66142247. The next prime is 66142259. The reversal of 66142253 is 35224166.

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

It is an interprime number because it is at equal distance from previous prime (66142247) and next prime (66142259).

It can be written as a sum of positive squares in 2 ways, for example, as 56821444 + 9320809 = 7538^2 + 3053^2 .

It is a cyclic number.

It is not a de Polignac number, because 66142253 - 2¹² = 66138157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66142259) 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, 80450 + ... + 81267.

It is an arithmetic number, because the mean of its divisors is an integer number (16576095).

Almost surely, 2^66142253 is an apocalyptic number.

It is an amenable number.

66142253 is a deficient number, since it is larger than the sum of its proper divisors (162127).

66142253 is a wasteful number, since it uses less digits than its factorization.

66142253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162126.

The product of its digits is 8640, while the sum is 29.

The square root of 66142253 is about 8132.7887590912. The cubic root of 66142253 is about 404.4141364003.

The spelling of 66142253 in words is "sixty-six million, one hundred forty-two thousand, two hundred fifty-three".