20251607009 has 2 divisors, whose sum is σ = 20251607010. Its totient is φ = 20251607008.

The previous prime is 20251606979. The next prime is 20251607059. The reversal of 20251607009 is 90070615202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17495881984 + 2755725025 = 132272^2 + 52495^2 .

It is a cyclic number.

It is not a de Polignac number, because 20251607009 - 2²⁴ = 20234829793 is a prime.

It is not a weakly prime, because it can be changed into another prime (20251607059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10125803504 + 10125803505.

It is an arithmetic number, because the mean of its divisors is an integer number (10125803505).

Almost surely, 2^20251607009 is an apocalyptic number.

It is an amenable number.

20251607009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20251607009 is an equidigital number, since it uses as much as digits as its factorization.

20251607009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 32.

The spelling of 20251607009 in words is "twenty billion, two hundred fifty-one million, six hundred seven thousand, nine".