12991648397 has 16 divisors (see below), whose sum is σ = 16329933312. Its totient is φ = 10060398720.

The previous prime is 12991648367. The next prime is 12991648441. The reversal of 12991648397 is 79384619921.

It is a cyclic number.

It is not a de Polignac number, because 12991648397 - 2³² = 8696681101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12991648357) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1514504 + ... + 1523057.

It is an arithmetic number, because the mean of its divisors is an integer number (1020620832).

Almost surely, 2^12991648397 is an apocalyptic number.

It is an amenable number.

12991648397 is a deficient number, since it is larger than the sum of its proper divisors (3338284915).

12991648397 is a wasteful number, since it uses less digits than its factorization.

12991648397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3037628.

The product of its digits is 5878656, while the sum is 59.

The spelling of 12991648397 in words is "twelve billion, nine hundred ninety-one million, six hundred forty-eight thousand, three hundred ninety-seven".