25122027977 has 2 divisors, whose sum is σ = 25122027978. Its totient is φ = 25122027976.

The previous prime is 25122027923. The next prime is 25122028033. The reversal of 25122027977 is 77972022152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14836214416 + 10285813561 = 121804^2 + 101419^2 .

It is a cyclic number.

It is not a de Polignac number, because 25122027977 - 2¹⁶ = 25121962441 is a prime.

It is a super-2 number, since 2×25122027977² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25122020977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12561013988 + 12561013989.

It is an arithmetic number, because the mean of its divisors is an integer number (12561013989).

Almost surely, 2^25122027977 is an apocalyptic number.

It is an amenable number.

25122027977 is a deficient number, since it is larger than the sum of its proper divisors (1).

25122027977 is an equidigital number, since it uses as much as digits as its factorization.

25122027977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 246960, while the sum is 44.

The spelling of 25122027977 in words is "twenty-five billion, one hundred twenty-two million, twenty-seven thousand, nine hundred seventy-seven".