661044611201 has 8 divisors (see below), whose sum is σ = 731134580904. Its totient is φ = 593703267840.

The previous prime is 661044611197. The next prime is 661044611231. The reversal of 661044611201 is 102116440166.

It can be written as a sum of positive squares in 4 ways, for example, as 231095564176 + 429949047025 = 480724^2 + 655705^2 .

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 661044611201 - 2² = 661044611197 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661044611231) 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, 687156080 + ... + 687157041.

It is an arithmetic number, because the mean of its divisors is an integer number (91391822613).

Almost surely, 2^661044611201 is an apocalyptic number.

It is an amenable number.

661044611201 is a deficient number, since it is larger than the sum of its proper divisors (70089969703).

661044611201 is a wasteful number, since it uses less digits than its factorization.

661044611201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374313171.

The product of its (nonzero) digits is 6912, while the sum is 32.

The spelling of 661044611201 in words is "six hundred sixty-one billion, forty-four million, six hundred eleven thousand, two hundred one".