1056755818821 has 4 divisors (see below), whose sum is σ = 1409007758432. Its totient is φ = 704503879212.

The previous prime is 1056755818819. The next prime is 1056755818823. The reversal of 1056755818821 is 1288185576501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1056755818819) and next prime (1056755818823).

It is not a de Polignac number, because 1056755818821 - 2¹ = 1056755818819 is a prime.

It is a super-2 number, since 2×1056755818821² (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 (1056755818823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176125969801 + ... + 176125969806.

It is an arithmetic number, because the mean of its divisors is an integer number (352251939608).

Almost surely, 2^{1056755818821} is an apocalyptic number.

It is an amenable number.

1056755818821 is a deficient number, since it is larger than the sum of its proper divisors (352251939611).

1056755818821 is an equidigital number, since it uses as much as digits as its factorization.

1056755818821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352251939610.

The product of its (nonzero) digits is 5376000, while the sum is 57.

The spelling of 1056755818821 in words is "one trillion, fifty-six billion, seven hundred fifty-five million, eight hundred eighteen thousand, eight hundred twenty-one".