12545730778 has 24 divisors (see below), whose sum is σ = 21895660800. Its totient is φ = 5375602008.

The previous prime is 12545730767. The next prime is 12545730779. The reversal of 12545730778 is 87703754521.

It is a happy number.

It is a super-3 number, since 3×12545730778³ (a number of 31 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (12545730779) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 585213 + ... + 606271.

It is an arithmetic number, because the mean of its divisors is an integer number (912319200).

Almost surely, 2^12545730778 is an apocalyptic number.

12545730778 is a deficient number, since it is larger than the sum of its proper divisors (9349930022).

12545730778 is a wasteful number, since it uses less digits than its factorization.

12545730778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27154 (or 27147 counting only the distinct ones).

The product of its (nonzero) digits is 1646400, while the sum is 49.

The spelling of 12545730778 in words is "twelve billion, five hundred forty-five million, seven hundred thirty thousand, seven hundred seventy-eight".