64124601521 has 2 divisors, whose sum is σ = 64124601522. Its totient is φ = 64124601520.

The previous prime is 64124601517. The next prime is 64124601533. The reversal of 64124601521 is 12510642146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61622601121 + 2502000400 = 248239^2 + 50020^2 .

It is a cyclic number.

It is not a de Polignac number, because 64124601521 - 2² = 64124601517 is a prime.

It is a super-2 number, since 2×64124601521² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64124601571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32062300760 + 32062300761.

It is an arithmetic number, because the mean of its divisors is an integer number (32062300761).

Almost surely, 2^64124601521 is an apocalyptic number.

It is an amenable number.

64124601521 is a deficient number, since it is larger than the sum of its proper divisors (1).

64124601521 is an equidigital number, since it uses as much as digits as its factorization.

64124601521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 32.

The spelling of 64124601521 in words is "sixty-four billion, one hundred twenty-four million, six hundred one thousand, five hundred twenty-one".