661004550041 has 6 divisors (see below), whose sum is σ = 726558720426. Its totient is φ = 600913227200.

The previous prime is 661004549993. The next prime is 661004550061. The reversal of 661004550041 is 140055400166.

It can be written as a sum of positive squares in only one way, i.e., 614350278025 + 46654272016 = 783805^2 + 215996^2 .

It is not a de Polignac number, because 661004550041 - 2²² = 661000355737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661004550061) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2731423640 + ... + 2731423881.

It is an arithmetic number, because the mean of its divisors is an integer number (121093120071).

Almost surely, 2^661004550041 is an apocalyptic number.

It is an amenable number.

661004550041 is a deficient number, since it is larger than the sum of its proper divisors (65554170385).

661004550041 is a wasteful number, since it uses less digits than its factorization.

661004550041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5462847543 (or 5462847532 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The spelling of 661004550041 in words is "six hundred sixty-one billion, four million, five hundred fifty thousand, forty-one".