65090806641 has 27 divisors (see below), whose sum is σ = 109379270091. Its totient is φ = 37191685104.

The previous prime is 65090806639. The next prime is 65090806657. The reversal of 65090806641 is 14660809056.

The square root of 65090806641 is 255129.

It is a perfect power (a square), and thus also a powerful number.

65090806641 is a `hidden beast` number, since 6 + 509 + 0 + 80 + 6 + 64 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 64044931041 + 1045875600 = 253071^2 + 32340^2 .

It is not a de Polignac number, because 65090806641 - 2¹ = 65090806639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65090806621) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5351635 + ... + 5363783.

Almost surely, 2^65090806641 is an apocalyptic number.

65090806641 is the 255129-th square number.

65090806641 is the 127565-th centered octagonal number.

It is an amenable number.

65090806641 is a deficient number, since it is larger than the sum of its proper divisors (44288463450).

65090806641 is an frugal number, since it uses more digits than its factorization.

65090806641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24318 (or 12159 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 65090806641 in words is "sixty-five billion, ninety million, eight hundred six thousand, six hundred forty-one".