66561053241 has 8 divisors (see below), whose sum is σ = 93968545824. Its totient is φ = 41763798080.

The previous prime is 66561053231. The next prime is 66561053249. The reversal of 66561053241 is 14235016566.

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 66561053241 - 2¹⁹ = 66560528953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66561053241.

It is not an unprimeable number, because it can be changed into a prime (66561053249) 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, 652559295 + ... + 652559396.

It is an arithmetic number, because the mean of its divisors is an integer number (11746068228).

Almost surely, 2^66561053241 is an apocalyptic number.

It is an amenable number.

66561053241 is a deficient number, since it is larger than the sum of its proper divisors (27407492583).

66561053241 is a wasteful number, since it uses less digits than its factorization.

66561053241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305118711.

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 66561053241 in words is "sixty-six billion, five hundred sixty-one million, fifty-three thousand, two hundred forty-one".