12920542786 has 8 divisors (see below), whose sum is σ = 19381471884. Its totient is φ = 6460052160.

The previous prime is 12920542781. The next prime is 12920542787. The reversal of 12920542786 is 68724502921.

It can be written as a sum of positive squares in 2 ways, for example, as 11917870561 + 1002672225 = 109169^2 + 31665^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (12920542781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21915 + ... + 162238.

Almost surely, 2^12920542786 is an apocalyptic number.

12920542786 is a deficient number, since it is larger than the sum of its proper divisors (6460929098).

12920542786 is a wasteful number, since it uses less digits than its factorization.

12920542786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219236.

The product of its (nonzero) digits is 483840, while the sum is 46.

It can be divided in two parts, 129205 and 42786, that added together give a triangular number (171991 = T₅₈₆).

The spelling of 12920542786 in words is "twelve billion, nine hundred twenty million, five hundred forty-two thousand, seven hundred eighty-six".