12977222536 has 8 divisors (see below), whose sum is σ = 24332292270. Its totient is φ = 6488611264.

The previous prime is 12977222519. The next prime is 12977222549. The reversal of 12977222536 is 63522277921.

It can be written as a sum of positive squares in only one way, i.e., 12221302500 + 755920036 = 110550^2 + 27494^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811076401 + ... + 811076416.

Almost surely, 2^12977222536 is an apocalyptic number.

It is an amenable number.

12977222536 is a deficient number, since it is larger than the sum of its proper divisors (11355069734).

12977222536 is a wasteful number, since it uses less digits than its factorization.

12977222536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1622152823 (or 1622152819 counting only the distinct ones).

The product of its digits is 635040, while the sum is 46.

The spelling of 12977222536 in words is "twelve billion, nine hundred seventy-seven million, two hundred twenty-two thousand, five hundred thirty-six".