1056665513 has 4 divisors (see below), whose sum is σ = 1057607568. Its totient is φ = 1055723460.

The previous prime is 1056665497. The next prime is 1056665521. The reversal of 1056665513 is 3155666501.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3155666501 = 13 ⋅242743577.

It is a cyclic number.

It is not a de Polignac number, because 1056665513 - 2⁴ = 1056665497 is a prime.

It is a super-2 number, since 2×1056665513² = 2233084012727106338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1056665713) 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, 469343 + ... + 471588.

It is an arithmetic number, because the mean of its divisors is an integer number (264401892).

Almost surely, 2^1056665513 is an apocalyptic number.

It is an amenable number.

1056665513 is a deficient number, since it is larger than the sum of its proper divisors (942055).

1056665513 is an equidigital number, since it uses as much as digits as its factorization.

1056665513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942054.

The product of its (nonzero) digits is 81000, while the sum is 38.

The square root of 1056665513 is about 32506.3918791366. The cubic root of 1056665513 is about 1018.5425529254.

The spelling of 1056665513 in words is "one billion, fifty-six million, six hundred sixty-five thousand, five hundred thirteen".