66071551 has 12 divisors (see below), whose sum is σ = 82771752. Its totient is φ = 52275888.

The previous prime is 66071543. The next prime is 66071557. The reversal of 66071551 is 15517066.

It is not a de Polignac number, because 66071551 - 2³ = 66071543 is a prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66071557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51225 + ... + 52498.

It is an arithmetic number, because the mean of its divisors is an integer number (6897646).

Almost surely, 2^66071551 is an apocalyptic number.

66071551 is a deficient number, since it is larger than the sum of its proper divisors (16700201).

66071551 is a wasteful number, since it uses less digits than its factorization.

66071551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103750 (or 103743 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 66071551 is about 8128.4408714095. The cubic root of 66071551 is about 404.2699870805.

The spelling of 66071551 in words is "sixty-six million, seventy-one thousand, five hundred fifty-one".