1275660407791 has 16 divisors (see below), whose sum is σ = 1593754122240. Its totient is φ = 991945867680.

The previous prime is 1275660407719. The next prime is 1275660407807. The reversal of 1275660407791 is 1977040665721.

It is a cyclic number.

It is not a de Polignac number, because 1275660407791 - 2³⁹ = 725904593903 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1275660405791) 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 15 ways as a sum of consecutive naturals, for example, 17256456 + ... + 17330221.

It is an arithmetic number, because the mean of its divisors is an integer number (99609632640).

Almost surely, 2^{1275660407791} is an apocalyptic number.

1275660407791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1275660407791 is a deficient number, since it is larger than the sum of its proper divisors (318093714449).

1275660407791 is a wasteful number, since it uses less digits than its factorization.

1275660407791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34587174.

The product of its (nonzero) digits is 4445280, while the sum is 55.

The spelling of 1275660407791 in words is "one trillion, two hundred seventy-five billion, six hundred sixty million, four hundred seven thousand, seven hundred ninety-one".