1277783831064 has 256 divisors, whose sum is σ = 3710346393600. Its totient is φ = 363777103872.

The previous prime is 1277783831063. The next prime is 1277783831099. The reversal of 1277783831064 is 4601383877721.

It is a junction number, because it is equal to n+sod(n) for n = 1277783830995 and 1277783831013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1277783831063) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20589409 + ... + 20651375.

It is an arithmetic number, because the mean of its divisors is an integer number (14493540600).

Almost surely, 2^{1277783831064} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1277783831064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1855173196800).

1277783831064 is an abundant number, since it is smaller than the sum of its proper divisors (2432562562536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1277783831064 is a wasteful number, since it uses less digits than its factorization.

1277783831064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62114 (or 62110 counting only the distinct ones).

The product of its (nonzero) digits is 9483264, while the sum is 57.

The spelling of 1277783831064 in words is "one trillion, two hundred seventy-seven billion, seven hundred eighty-three million, eight hundred thirty-one thousand, sixty-four".