648135393557 has 4 divisors (see below), whose sum is σ = 654817201836. Its totient is φ = 641453585280.

The previous prime is 648135393523. The next prime is 648135393593. The reversal of 648135393557 is 755393531846.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 313072701841 + 335062691716 = 559529^2 + 578846^2 .

It is a cyclic number.

It is not a de Polignac number, because 648135393557 - 2²² = 648131199253 is a prime.

It is a super-2 number, since 2×648135393557² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 648135393496 and 648135393505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648135383557) 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 in 3 ways as a sum of consecutive naturals, for example, 3340903994 + ... + 3340904187.

It is an arithmetic number, because the mean of its divisors is an integer number (163704300459).

Almost surely, 2^648135393557 is an apocalyptic number.

It is an amenable number.

648135393557 is a deficient number, since it is larger than the sum of its proper divisors (6681808279).

648135393557 is an equidigital number, since it uses as much as digits as its factorization.

648135393557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6681808278.

The product of its digits is 40824000, while the sum is 59.

The spelling of 648135393557 in words is "six hundred forty-eight billion, one hundred thirty-five million, three hundred ninety-three thousand, five hundred fifty-seven".