263773779461 has 2 divisors, whose sum is σ = 263773779462. Its totient is φ = 263773779460.

The previous prime is 263773779349. The next prime is 263773779473. The reversal of 263773779461 is 164977377362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198988258561 + 64785520900 = 446081^2 + 254530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-263773779461 is a prime.

It is a super-2 number, since 2×263773779461² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 263773779394 and 263773779403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263773779161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131886889730 + 131886889731.

It is an arithmetic number, because the mean of its divisors is an integer number (131886889731).

Almost surely, 2^263773779461 is an apocalyptic number.

It is an amenable number.

263773779461 is a deficient number, since it is larger than the sum of its proper divisors (1).

263773779461 is an equidigital number, since it uses as much as digits as its factorization.

263773779461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56010528, while the sum is 62.

The spelling of 263773779461 in words is "two hundred sixty-three billion, seven hundred seventy-three million, seven hundred seventy-nine thousand, four hundred sixty-one".