2781156817263 has 32 divisors (see below), whose sum is σ = 4334884791552. Its totient is φ = 1567286336000.

The previous prime is 2781156817261. The next prime is 2781156817273. The reversal of 2781156817263 is 3627186511872.

It is not a de Polignac number, because 2781156817263 - 2¹ = 2781156817261 is a prime.

It is a super-2 number, since 2×2781156817263² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2781156817261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29817888 + ... + 29911013.

It is an arithmetic number, because the mean of its divisors is an integer number (135465149736).

Almost surely, 2^{2781156817263} is an apocalyptic number.

2781156817263 is a deficient number, since it is larger than the sum of its proper divisors (1553727974289).

2781156817263 is a wasteful number, since it uses less digits than its factorization.

2781156817263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59729015.

The product of its digits is 6773760, while the sum is 57.

The spelling of 2781156817263 in words is "two trillion, seven hundred eighty-one billion, one hundred fifty-six million, eight hundred seventeen thousand, two hundred sixty-three".