12901779396 has 81 divisors (see below), whose sum is σ = 35868002989. Its totient is φ = 3907358400.

The previous prime is 12901779389. The next prime is 12901779403. The reversal of 12901779396 is 69397710921.

It is a happy number.

The square root of 12901779396 is 113586.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (12901779389) and next prime (12901779403).

It can be written as a sum of positive squares in only one way, i.e., 9528492996 + 3373286400 = 97614^2 + 58080^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 7495816 + ... + 7497536.

Almost surely, 2^12901779396 is an apocalyptic number.

12901779396 is the 113586-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12901779396

12901779396 is an abundant number, since it is smaller than the sum of its proper divisors (22966223593).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12901779396 is a wasteful number, since it uses less digits than its factorization.

12901779396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3474 (or 1737 counting only the distinct ones).

The product of its (nonzero) digits is 1285956, while the sum is 54.

It can be divided in two parts, 12901779 and 396, that multiplied together give a square (5109104484 = 71478²).

The spelling of 12901779396 in words is "twelve billion, nine hundred one million, seven hundred seventy-nine thousand, three hundred ninety-six".