1263958606691 has 8 divisors (see below), whose sum is σ = 1378879795200. Its totient is φ = 1149040061640.

The previous prime is 1263958606619. The next prime is 1263958606699. The reversal of 1263958606691 is 1966068593621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1263958606691 - 2¹⁰ = 1263958605667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1263958606699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 415070 + ... + 1643228.

It is an arithmetic number, because the mean of its divisors is an integer number (172359974400).

Almost surely, 2^{1263958606691} is an apocalyptic number.

1263958606691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1263958606691 is a deficient number, since it is larger than the sum of its proper divisors (114921188509).

1263958606691 is a wasteful number, since it uses less digits than its factorization.

1263958606691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321729.

The product of its (nonzero) digits is 25194240, while the sum is 62.

The spelling of 1263958606691 in words is "one trillion, two hundred sixty-three billion, nine hundred fifty-eight million, six hundred six thousand, six hundred ninety-one".