12521016164 has 12 divisors (see below), whose sum is σ = 22325208444. Its totient is φ = 6142385184.

The previous prime is 12521016139. The next prime is 12521016173. The reversal of 12521016164 is 46161012521.

It can be written as a sum of positive squares in 2 ways, for example, as 11136580900 + 1384435264 = 105530^2 + 37208^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29530487 + ... + 29530910.

It is an arithmetic number, because the mean of its divisors is an integer number (1860434037).

Almost surely, 2^12521016164 is an apocalyptic number.

It is an amenable number.

12521016164 is a deficient number, since it is larger than the sum of its proper divisors (9804192280).

12521016164 is a wasteful number, since it uses less digits than its factorization.

12521016164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59061454 (or 59061452 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

Adding to 12521016164 its reverse (46161012521), we get a palindrome (58682028685).

The spelling of 12521016164 in words is "twelve billion, five hundred twenty-one million, sixteen thousand, one hundred sixty-four".