66570567261 has 32 divisors (see below), whose sum is σ = 100043953152. Its totient is φ = 39024840960.

The previous prime is 66570567253. The next prime is 66570567263. The reversal of 66570567261 is 16276507566.

It is not a de Polignac number, because 66570567261 - 2³ = 66570567253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66570567263) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81580 + ... + 373893.

It is an arithmetic number, because the mean of its divisors is an integer number (3126373536).

Almost surely, 2^66570567261 is an apocalyptic number.

It is an amenable number.

66570567261 is a deficient number, since it is larger than the sum of its proper divisors (33473385891).

66570567261 is a wasteful number, since it uses less digits than its factorization.

66570567261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455633.

The product of its (nonzero) digits is 3175200, while the sum is 51.

The spelling of 66570567261 in words is "sixty-six billion, five hundred seventy million, five hundred sixty-seven thousand, two hundred sixty-one".