1326771007557 has 16 divisors (see below), whose sum is σ = 1836999362688. Its totient is φ = 851119384320.

The previous prime is 1326771007553. The next prime is 1326771007603. The reversal of 1326771007557 is 7557001776231.

It is not a de Polignac number, because 1326771007557 - 2² = 1326771007553 is a prime.

It is a super-2 number, since 2×1326771007557² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1326771007553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73872913 + ... + 73890870.

It is an arithmetic number, because the mean of its divisors is an integer number (114812460168).

Almost surely, 2^{1326771007557} is an apocalyptic number.

It is an amenable number.

1326771007557 is a deficient number, since it is larger than the sum of its proper divisors (510228355131).

1326771007557 is a wasteful number, since it uses less digits than its factorization.

1326771007557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147763900.

The product of its (nonzero) digits is 2160900, while the sum is 51.

The spelling of 1326771007557 in words is "one trillion, three hundred twenty-six billion, seven hundred seventy-one million, seven thousand, five hundred fifty-seven".