1277704920366 has 128 divisors (see below), whose sum is σ = 3419577907200. Its totient is φ = 345728908800.

The previous prime is 1277704920329. The next prime is 1277704920367. The reversal of 1277704920366 is 6630294077721.

1277704920366 is a `hidden beast` number, since 1 + 27 + 7 + 70 + 492 + 0 + 3 + 66 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1277704920367) 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 63 ways as a sum of consecutive naturals, for example, 150550 + ... + 1605638.

It is an arithmetic number, because the mean of its divisors is an integer number (26715452400).

Almost surely, 2^{1277704920366} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1277704920366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1709788953600).

1277704920366 is an abundant number, since it is smaller than the sum of its proper divisors (2141872986834).

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

1277704920366 is a wasteful number, since it uses less digits than its factorization.

1277704920366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1455231 (or 1455225 counting only the distinct ones).

The product of its (nonzero) digits is 5334336, while the sum is 54.

The spelling of 1277704920366 in words is "one trillion, two hundred seventy-seven billion, seven hundred four million, nine hundred twenty thousand, three hundred sixty-six".