64780577401 has 2 divisors, whose sum is σ = 64780577402. Its totient is φ = 64780577400.

The previous prime is 64780577371. The next prime is 64780577437. The reversal of 64780577401 is 10477508746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57287943801 + 7492633600 = 239349^2 + 86560^2 .

It is a cyclic number.

It is not a de Polignac number, because 64780577401 - 2⁵ = 64780577369 is a prime.

It is not a weakly prime, because it can be changed into another prime (64780577441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32390288700 + 32390288701.

It is an arithmetic number, because the mean of its divisors is an integer number (32390288701).

Almost surely, 2^64780577401 is an apocalyptic number.

It is an amenable number.

64780577401 is a deficient number, since it is larger than the sum of its proper divisors (1).

64780577401 is an equidigital number, since it uses as much as digits as its factorization.

64780577401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1317120, while the sum is 49.

The spelling of 64780577401 in words is "sixty-four billion, seven hundred eighty million, five hundred seventy-seven thousand, four hundred one".