25277780069 has 2 divisors, whose sum is σ = 25277780070. Its totient is φ = 25277780068.

The previous prime is 25277779997. The next prime is 25277780071. The reversal of 25277780069 is 96008777252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24034300900 + 1243479169 = 155030^2 + 35263^2 .

It is a cyclic number.

It is not a de Polignac number, because 25277780069 - 2¹² = 25277775973 is a prime.

It is a super-2 number, since 2×25277780069² (a number of 22 digits) contains 22 as substring.

Together with 25277780071, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25277780069.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25277380069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12638890034 + 12638890035.

It is an arithmetic number, because the mean of its divisors is an integer number (12638890035).

Almost surely, 2^25277780069 is an apocalyptic number.

It is an amenable number.

25277780069 is a deficient number, since it is larger than the sum of its proper divisors (1).

25277780069 is an equidigital number, since it uses as much as digits as its factorization.

25277780069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2963520, while the sum is 53.

The spelling of 25277780069 in words is "twenty-five billion, two hundred seventy-seven million, seven hundred eighty thousand, sixty-nine".