12920526991 has 4 divisors (see below), whose sum is σ = 13022263552. Its totient is φ = 12818790432.

The previous prime is 12920526979. The next prime is 12920527013. The reversal of 12920526991 is 19962502921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12920526991 - 2⁷ = 12920526863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12920526961) 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, 50868090 + ... + 50868343.

It is an arithmetic number, because the mean of its divisors is an integer number (3255565888).

Almost surely, 2^12920526991 is an apocalyptic number.

12920526991 is a deficient number, since it is larger than the sum of its proper divisors (101736561).

12920526991 is a wasteful number, since it uses less digits than its factorization.

12920526991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101736560.

The product of its (nonzero) digits is 174960, while the sum is 46.

The spelling of 12920526991 in words is "twelve billion, nine hundred twenty million, five hundred twenty-six thousand, nine hundred ninety-one".