1316527776981 has 6 divisors (see below), whose sum is σ = 1901651233430. Its totient is φ = 877685184648.

The previous prime is 1316527776929. The next prime is 1316527777009. The reversal of 1316527776981 is 1896777256131.

1316527776981 is a `hidden beast` number, since 1 + 3 + 16 + 527 + 7 + 7 + 6 + 98 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1266738995025 + 49788781956 = 1125495^2 + 223134^2 .

It is not a de Polignac number, because 1316527776981 - 2¹⁰ = 1316527775957 is a prime.

It is a super-2 number, since 2×1316527776981² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1316527776281) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73140432046 + ... + 73140432063.

Almost surely, 2^{1316527776981} is an apocalyptic number.

It is an amenable number.

1316527776981 is a deficient number, since it is larger than the sum of its proper divisors (585123456449).

1316527776981 is a wasteful number, since it uses less digits than its factorization.

1316527776981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146280864115 (or 146280864112 counting only the distinct ones).

The product of its digits is 26671680, while the sum is 63.

The spelling of 1316527776981 in words is "one trillion, three hundred sixteen billion, five hundred twenty-seven million, seven hundred seventy-six thousand, nine hundred eighty-one".