1263780382551 has 32 divisors (see below), whose sum is σ = 1790030578176. Its totient is φ = 790352640000.

The previous prime is 1263780382547. The next prime is 1263780382559. The reversal of 1263780382551 is 1552830873621.

It is a happy number.

It is not a de Polignac number, because 1263780382551 - 2² = 1263780382547 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 1263780382494 and 1263780382503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263780382559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 83570271 + ... + 83585391.

It is an arithmetic number, because the mean of its divisors is an integer number (55938455568).

Almost surely, 2^{1263780382551} is an apocalyptic number.

1263780382551 is a deficient number, since it is larger than the sum of its proper divisors (526250195625).

1263780382551 is a wasteful number, since it uses less digits than its factorization.

1263780382551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20423.

The product of its (nonzero) digits is 2419200, while the sum is 51.

The spelling of 1263780382551 in words is "one trillion, two hundred sixty-three billion, seven hundred eighty million, three hundred eighty-two thousand, five hundred fifty-one".