263666212025 has 24 divisors (see below), whose sum is σ = 327946956480. Its totient is φ = 210287701440.

The previous prime is 263666212013. The next prime is 263666212037. The reversal of 263666212025 is 520212666362.

It is an interprime number because it is at equal distance from previous prime (263666212013) and next prime (263666212037).

It is not a de Polignac number, because 263666212025 - 2²² = 263662017721 is a prime.

It is a super-2 number, since 2×263666212025² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43628654 + ... + 43634696.

It is an arithmetic number, because the mean of its divisors is an integer number (13664456520).

Almost surely, 2^263666212025 is an apocalyptic number.

263666212025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

263666212025 is a deficient number, since it is larger than the sum of its proper divisors (64280744455).

263666212025 is a wasteful number, since it uses less digits than its factorization.

263666212025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11105 (or 11100 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 41.

Adding to 263666212025 its reverse (520212666362), we get a palindrome (783878878387).

The spelling of 263666212025 in words is "two hundred sixty-three billion, six hundred sixty-six million, two hundred twelve thousand, twenty-five".