1366237621849 has 2 divisors, whose sum is σ = 1366237621850. Its totient is φ = 1366237621848.

The previous prime is 1366237621829. The next prime is 1366237621871. The reversal of 1366237621849 is 9481267326631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1187515831824 + 178721790025 = 1089732^2 + 422755^2 .

It is a cyclic number.

It is not a de Polignac number, because 1366237621849 - 2³³ = 1357647687257 is a prime.

It is a super-2 number, since 2×1366237621849² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1366237621793 and 1366237621802.

It is not a weakly prime, because it can be changed into another prime (1366237621829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 683118810924 + 683118810925.

It is an arithmetic number, because the mean of its divisors is an integer number (683118810925).

Almost surely, 2^{1366237621849} is an apocalyptic number.

It is an amenable number.

1366237621849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1366237621849 is an equidigital number, since it uses as much as digits as its factorization.

1366237621849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15676416, while the sum is 58.

The spelling of 1366237621849 in words is "one trillion, three hundred sixty-six billion, two hundred thirty-seven million, six hundred twenty-one thousand, eight hundred forty-nine".