1355400665 has 4 divisors (see below), whose sum is σ = 1626480804. Its totient is φ = 1084320528.

The previous prime is 1355400653. The next prime is 1355400679. The reversal of 1355400665 is 5660045531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1053197209 + 302203456 = 32453^2 + 17384^2 .

It is a cyclic number.

It is not a de Polignac number, because 1355400665 - 2¹⁰ = 1355399641 is a prime.

It is a super-2 number, since 2×1355400665² = 3674221925364884450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135540062 + ... + 135540071.

It is an arithmetic number, because the mean of its divisors is an integer number (406620201).

Almost surely, 2^1355400665 is an apocalyptic number.

It is an amenable number.

1355400665 is a deficient number, since it is larger than the sum of its proper divisors (271080139).

1355400665 is an equidigital number, since it uses as much as digits as its factorization.

1355400665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271080138.

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 1355400665 is about 36815.7665273996. The cubic root of 1355400665 is about 1106.6812827197.

The spelling of 1355400665 in words is "one billion, three hundred fifty-five million, four hundred thousand, six hundred sixty-five".