1275770721157 has 8 divisors (see below), whose sum is σ = 1355432081400. Its totient is φ = 1198487312064.

The previous prime is 1275770721097. The next prime is 1275770721167. The reversal of 1275770721157 is 7511270775721.

It can be written as a sum of positive squares in 4 ways, for example, as 519342187716 + 756428533441 = 720654^2 + 869729^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1275770721157 - 2¹¹ = 1275770719109 is a prime.

It is a super-2 number, since 2×1275770721157² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1275770721167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 594486682 + ... + 594488827.

It is an arithmetic number, because the mean of its divisors is an integer number (169429010175).

Almost surely, 2^{1275770721157} is an apocalyptic number.

It is an amenable number.

1275770721157 is a deficient number, since it is larger than the sum of its proper divisors (79661360243).

1275770721157 is a wasteful number, since it uses less digits than its factorization.

1275770721157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1188975575.

The product of its (nonzero) digits is 1680700, while the sum is 52.

The spelling of 1275770721157 in words is "one trillion, two hundred seventy-five billion, seven hundred seventy million, seven hundred twenty-one thousand, one hundred fifty-seven".