1371346645561 has 4 divisors (see below), whose sum is σ = 1408410068452. Its totient is φ = 1334283222672.

The previous prime is 1371346645553. The next prime is 1371346645573. The reversal of 1371346645561 is 1655466431731.

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 489167354025 + 882179291536 = 699405^2 + 939244^2 .

It is a cyclic number.

It is not a de Polignac number, because 1371346645561 - 2³ = 1371346645553 is a prime.

It is a super-2 number, since 2×1371346645561² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1371346645499 and 1371346645508.

It is not an unprimeable number, because it can be changed into a prime (1371346645061) 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, 18531711390 + ... + 18531711463.

It is an arithmetic number, because the mean of its divisors is an integer number (352102517113).

Almost surely, 2^{1371346645561} is an apocalyptic number.

It is an amenable number.

1371346645561 is a deficient number, since it is larger than the sum of its proper divisors (37063422891).

1371346645561 is an equidigital number, since it uses as much as digits as its factorization.

1371346645561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37063422890.

The product of its digits is 5443200, while the sum is 52.

The spelling of 1371346645561 in words is "one trillion, three hundred seventy-one billion, three hundred forty-six million, six hundred forty-five thousand, five hundred sixty-one".