65439880551461 has 16 divisors (see below), whose sum is σ = 70583017167600. Its totient is φ = 60312408357888.

The previous prime is 65439880551421. The next prime is 65439880551523. The reversal of 65439880551461 is 16415508893456.

It can be written as a sum of positive squares in 8 ways, for example, as 6924739620100 + 58515140931361 = 2631490^2 + 7649519^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65439880551461 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 (65439880551421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30306605 + ... + 32393981.

It is an arithmetic number, because the mean of its divisors is an integer number (4411438572975).

Almost surely, 2^{65439880551461} is an apocalyptic number.

It is an amenable number.

65439880551461 is a deficient number, since it is larger than the sum of its proper divisors (5143136616139).

65439880551461 is a wasteful number, since it uses less digits than its factorization.

65439880551461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2091128.

The product of its (nonzero) digits is 124416000, while the sum is 65.

The spelling of 65439880551461 in words is "sixty-five trillion, four hundred thirty-nine billion, eight hundred eighty million, five hundred fifty-one thousand, four hundred sixty-one".