1263161621611 has 2 divisors, whose sum is σ = 1263161621612. Its totient is φ = 1263161621610.

The previous prime is 1263161621597. The next prime is 1263161621621. The reversal of 1263161621611 is 1161261613621.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1263161621611 - 2¹³ = 1263161613419 is a prime.

It is a super-2 number, since 2×1263161621611² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1263161621621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631580810805 + 631580810806.

It is an arithmetic number, because the mean of its divisors is an integer number (631580810806).

Almost surely, 2^{1263161621611} is an apocalyptic number.

1263161621611 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263161621611 is an equidigital number, since it uses as much as digits as its factorization.

1263161621611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The spelling of 1263161621611 in words is "one trillion, two hundred sixty-three billion, one hundred sixty-one million, six hundred twenty-one thousand, six hundred eleven".