1355213503661 has 4 divisors (see below), whose sum is σ = 1355224783452. Its totient is φ = 1355202223872.

The previous prime is 1355213503627. The next prime is 1355213503663. The reversal of 1355213503661 is 1663053125531.

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 735323400100 + 619890103561 = 857510^2 + 787331^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1355213503661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355213503663) 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, 5457716 + ... + 5700621.

It is an arithmetic number, because the mean of its divisors is an integer number (338806195863).

Almost surely, 2^{1355213503661} is an apocalyptic number.

It is an amenable number.

1355213503661 is a deficient number, since it is larger than the sum of its proper divisors (11279791).

1355213503661 is a wasteful number, since it uses less digits than its factorization.

1355213503661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11279790.

The product of its (nonzero) digits is 243000, while the sum is 41.

The spelling of 1355213503661 in words is "one trillion, three hundred fifty-five billion, two hundred thirteen million, five hundred three thousand, six hundred sixty-one".