65612021477 has 2 divisors, whose sum is σ = 65612021478. Its totient is φ = 65612021476.

The previous prime is 65612021473. The next prime is 65612021507. The reversal of 65612021477 is 77412021656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62395543681 + 3216477796 = 249791^2 + 56714^2 .

It is a cyclic number.

It is not a de Polignac number, because 65612021477 - 2² = 65612021473 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65612021473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32806010738 + 32806010739.

It is an arithmetic number, because the mean of its divisors is an integer number (32806010739).

Almost surely, 2^65612021477 is an apocalyptic number.

It is an amenable number.

65612021477 is a deficient number, since it is larger than the sum of its proper divisors (1).

65612021477 is an equidigital number, since it uses as much as digits as its factorization.

65612021477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141120, while the sum is 41.

The spelling of 65612021477 in words is "sixty-five billion, six hundred twelve million, twenty-one thousand, four hundred seventy-seven".