661023101544041 has 4 divisors (see below), whose sum is σ = 673495235535492. Its totient is φ = 648550967552592.

The previous prime is 661023101544017. The next prime is 661023101544101. The reversal of 661023101544041 is 140445101320166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 308881363150441 + 352141738393600 = 17575021^2 + 18765440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661023101544041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 661023101543986 and 661023101544004.

It is not an unprimeable number, because it can be changed into a prime (661023101541041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6236066995646 + ... + 6236066995751.

It is an arithmetic number, because the mean of its divisors is an integer number (168373808883873).

Almost surely, 2^{661023101544041} is an apocalyptic number.

It is an amenable number.

661023101544041 is a deficient number, since it is larger than the sum of its proper divisors (12472133991451).

661023101544041 is a wasteful number, since it uses less digits than its factorization.

661023101544041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12472133991450.

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 661023101544041 in words is "six hundred sixty-one trillion, twenty-three billion, one hundred one million, five hundred forty-four thousand, forty-one".