65490593621 has 2 divisors, whose sum is σ = 65490593622. Its totient is φ = 65490593620.

The previous prime is 65490593579. The next prime is 65490593647. The reversal of 65490593621 is 12639509456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35038598596 + 30451995025 = 187186^2 + 174505^2 .

It is a cyclic number.

It is not a de Polignac number, because 65490593621 - 2¹⁸ = 65490331477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65490593621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65490593681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32745296810 + 32745296811.

It is an arithmetic number, because the mean of its divisors is an integer number (32745296811).

Almost surely, 2^65490593621 is an apocalyptic number.

It is an amenable number.

65490593621 is a deficient number, since it is larger than the sum of its proper divisors (1).

65490593621 is an equidigital number, since it uses as much as digits as its factorization.

65490593621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1749600, while the sum is 50.

The spelling of 65490593621 in words is "sixty-five billion, four hundred ninety million, five hundred ninety-three thousand, six hundred twenty-one".