66071437 has 4 divisors (see below), whose sum is σ = 66255840. Its totient is φ = 65887036.

The previous prime is 66071431. The next prime is 66071461. The reversal of 66071437 is 73417066.

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, and also an emirpimes, since its reverse is a distinct semiprime: 73417066 = 2 ⋅36708533.

It is a cyclic number.

It is not a de Polignac number, because 66071437 - 2³ = 66071429 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 (66071431) 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, 91663 + ... + 92380.

It is an arithmetic number, because the mean of its divisors is an integer number (16563960).

Almost surely, 2^66071437 is an apocalyptic number.

It is an amenable number.

66071437 is a deficient number, since it is larger than the sum of its proper divisors (184403).

66071437 is a wasteful number, since it uses less digits than its factorization.

66071437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184402.

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 66071437 is about 8128.4338589915. The cubic root of 66071437 is about 404.2697545709.

The spelling of 66071437 in words is "sixty-six million, seventy-one thousand, four hundred thirty-seven".