12920561798 has 16 divisors (see below), whose sum is σ = 19702751040. Its totient is φ = 6353847336.

The previous prime is 12920561791. The next prime is 12920561821. The reversal of 12920561798 is 89716502921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12920561791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187436 + ... + 246927.

It is an arithmetic number, because the mean of its divisors is an integer number (1231421940).

Almost surely, 2^12920561798 is an apocalyptic number.

12920561798 is a deficient number, since it is larger than the sum of its proper divisors (6782189242).

12920561798 is a wasteful number, since it uses less digits than its factorization.

12920561798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434611.

The product of its (nonzero) digits is 544320, while the sum is 50.

The spelling of 12920561798 in words is "twelve billion, nine hundred twenty million, five hundred sixty-one thousand, seven hundred ninety-eight".