20251551079 has 2 divisors, whose sum is σ = 20251551080. Its totient is φ = 20251551078.

The previous prime is 20251551077. The next prime is 20251551127. The reversal of 20251551079 is 97015515202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20251551079 - 2¹ = 20251551077 is a prime.

It is a super-2 number, since 2×20251551079² (a number of 21 digits) contains 22 as substring.

Together with 20251551077, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20251551077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10125775539 + 10125775540.

It is an arithmetic number, because the mean of its divisors is an integer number (10125775540).

Almost surely, 2^20251551079 is an apocalyptic number.

20251551079 is a deficient number, since it is larger than the sum of its proper divisors (1).

20251551079 is an equidigital number, since it uses as much as digits as its factorization.

20251551079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31500, while the sum is 37.

The spelling of 20251551079 in words is "twenty billion, two hundred fifty-one million, five hundred fifty-one thousand, seventy-nine".