66461554250141 has 4 divisors (see below), whose sum is σ = 66465202594332. Its totient is φ = 66457905905952.

The previous prime is 66461554250129. The next prime is 66461554250167. The reversal of 66461554250141 is 14105245516466.

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 20767388265625 + 45694165984516 = 4557125^2 + 6759746^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66461554250141 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66461554250141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66461554250171) 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, 1824144770 + ... + 1824181203.

It is an arithmetic number, because the mean of its divisors is an integer number (16616300648583).

Almost surely, 2^{66461554250141} is an apocalyptic number.

It is an amenable number.

66461554250141 is a deficient number, since it is larger than the sum of its proper divisors (3648344191).

66461554250141 is a wasteful number, since it uses less digits than its factorization.

66461554250141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3648344190.

The product of its (nonzero) digits is 3456000, while the sum is 50.

The spelling of 66461554250141 in words is "sixty-six trillion, four hundred sixty-one billion, five hundred fifty-four million, two hundred fifty thousand, one hundred forty-one".