66570361561 has 8 divisors (see below), whose sum is σ = 75126427200. Its totient is φ = 58431665040.

The previous prime is 66570361469. The next prime is 66570361607. The reversal of 66570361561 is 16516307566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66570361561 - 2¹⁵ = 66570328793 is a prime.

It is a super-2 number, since 2×66570361561² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66570301561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104341941 + ... + 104342578.

It is an arithmetic number, because the mean of its divisors is an integer number (9390803400).

Almost surely, 2^66570361561 is an apocalyptic number.

It is an amenable number.

66570361561 is a deficient number, since it is larger than the sum of its proper divisors (8556065639).

66570361561 is a wasteful number, since it uses less digits than its factorization.

66570361561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208684559.

The product of its (nonzero) digits is 680400, while the sum is 46.

The spelling of 66570361561 in words is "sixty-six billion, five hundred seventy million, three hundred sixty-one thousand, five hundred sixty-one".