661510051141 has 8 divisors (see below), whose sum is σ = 663359818968. Its totient is φ = 659662080000.

The previous prime is 661510051127. The next prime is 661510051159. The reversal of 661510051141 is 141150015166.

It can be written as a sum of positive squares in 4 ways, for example, as 285337588900 + 376172462241 = 534170^2 + 613329^2 .

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 661510051141 - 2²³ = 661501662533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661510051841) 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, 289921 + ... + 1186201.

It is an arithmetic number, because the mean of its divisors is an integer number (82919977371).

Almost surely, 2^661510051141 is an apocalyptic number.

It is an amenable number.

661510051141 is a deficient number, since it is larger than the sum of its proper divisors (1849767827).

661510051141 is a wasteful number, since it uses less digits than its factorization.

661510051141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898343.

The product of its (nonzero) digits is 3600, while the sum is 31.

The spelling of 661510051141 in words is "six hundred sixty-one billion, five hundred ten million, fifty-one thousand, one hundred forty-one".