66513263471 has 4 divisors (see below), whose sum is σ = 67260603600. Its totient is φ = 65765923344.

The previous prime is 66513263449. The next prime is 66513263563. The reversal of 66513263471 is 17436231566.

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

It is a cyclic number.

It is not a de Polignac number, because 66513263471 - 2³⁴ = 49333394287 is a prime.

It is a super-3 number, since 3×66513263471³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66513233471) 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, 373669931 + ... + 373670108.

It is an arithmetic number, because the mean of its divisors is an integer number (16815150900).

Almost surely, 2^66513263471 is an apocalyptic number.

66513263471 is a deficient number, since it is larger than the sum of its proper divisors (747340129).

66513263471 is an equidigital number, since it uses as much as digits as its factorization.

66513263471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747340128.

The product of its digits is 544320, while the sum is 44.

The spelling of 66513263471 in words is "sixty-six billion, five hundred thirteen million, two hundred sixty-three thousand, four hundred seventy-one".