25277779001 has 2 divisors, whose sum is σ = 25277779002. Its totient is φ = 25277779000.

The previous prime is 25277778991. The next prime is 25277779027. The reversal of 25277779001 is 10097777252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19154560000 + 6123219001 = 138400^2 + 78251^2 .

It is a cyclic number.

It is not a de Polignac number, because 25277779001 - 2⁶ = 25277778937 is a prime.

It is a super-2 number, since 2×25277779001² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25277779801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12638889500 + 12638889501.

It is an arithmetic number, because the mean of its divisors is an integer number (12638889501).

Almost surely, 2^25277779001 is an apocalyptic number.

It is an amenable number.

25277779001 is a deficient number, since it is larger than the sum of its proper divisors (1).

25277779001 is an equidigital number, since it uses as much as digits as its factorization.

25277779001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432180, while the sum is 47.

The spelling of 25277779001 in words is "twenty-five billion, two hundred seventy-seven million, seven hundred seventy-nine thousand, one".