25500277779997 has 2 divisors, whose sum is σ = 25500277779998. Its totient is φ = 25500277779996.

The previous prime is 25500277779989. The next prime is 25500277780067. The reversal of 25500277779997 is 79997777200552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24612572743236 + 887705036761 = 4961106^2 + 942181^2 .

It is a cyclic number.

It is not a de Polignac number, because 25500277779997 - 2³ = 25500277779989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25500277179997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12750138889998 + 12750138889999.

It is an arithmetic number, because the mean of its divisors is an integer number (12750138889999).

Almost surely, 2^{25500277779997} is an apocalyptic number.

It is an amenable number.

25500277779997 is a deficient number, since it is larger than the sum of its proper divisors (1).

25500277779997 is an equidigital number, since it uses as much as digits as its factorization.

25500277779997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1225230300, while the sum is 76.

The spelling of 25500277779997 in words is "twenty-five trillion, five hundred billion, two hundred seventy-seven million, seven hundred seventy-nine thousand, nine hundred ninety-seven".