12520400546 has 4 divisors (see below), whose sum is σ = 18780600822. Its totient is φ = 6260200272.

The previous prime is 12520400539. The next prime is 12520400551. The reversal of 12520400546 is 64500402521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64500402521 = 23 ⋅2804365327.

It can be written as a sum of positive squares in only one way, i.e., 12053624521 + 466776025 = 109789^2 + 21605^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3130100135 + ... + 3130100138.

Almost surely, 2^12520400546 is an apocalyptic number.

12520400546 is a deficient number, since it is larger than the sum of its proper divisors (6260200276).

12520400546 is an equidigital number, since it uses as much as digits as its factorization.

12520400546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6260200275.

The product of its (nonzero) digits is 9600, while the sum is 29.

The spelling of 12520400546 in words is "twelve billion, five hundred twenty million, four hundred thousand, five hundred forty-six".