1263965977 has 2 divisors, whose sum is σ = 1263965978. Its totient is φ = 1263965976.

The previous prime is 1263965959. The next prime is 1263966001. The reversal of 1263965977 is 7795693621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 695429641 + 568536336 = 26371^2 + 23844^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263965977 - 2²³ = 1255577369 is a prime.

It is not a weakly prime, because it can be changed into another prime (1263965777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631982988 + 631982989.

It is an arithmetic number, because the mean of its divisors is an integer number (631982989).

Almost surely, 2^1263965977 is an apocalyptic number.

It is an amenable number.

1263965977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263965977 is an equidigital number, since it uses as much as digits as its factorization.

1263965977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4286520, while the sum is 55.

The square root of 1263965977 is about 35552.2991802218. The cubic root of 1263965977 is about 1081.2143339856.

The spelling of 1263965977 in words is "one billion, two hundred sixty-three million, nine hundred sixty-five thousand, nine hundred seventy-seven".