64824779477 has 2 divisors, whose sum is σ = 64824779478. Its totient is φ = 64824779476.

The previous prime is 64824779471. The next prime is 64824779521. The reversal of 64824779477 is 77497742846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48171909361 + 16652870116 = 219481^2 + 129046^2 .

It is a cyclic number.

It is not a de Polignac number, because 64824779477 - 2¹⁰ = 64824778453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64824779471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32412389738 + 32412389739.

It is an arithmetic number, because the mean of its divisors is an integer number (32412389739).

Almost surely, 2^64824779477 is an apocalyptic number.

It is an amenable number.

64824779477 is a deficient number, since it is larger than the sum of its proper divisors (1).

64824779477 is an equidigital number, since it uses as much as digits as its factorization.

64824779477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 132765696, while the sum is 65.

The spelling of 64824779477 in words is "sixty-four billion, eight hundred twenty-four million, seven hundred seventy-nine thousand, four hundred seventy-seven".