265645651 has 2 divisors, whose sum is σ = 265645652. Its totient is φ = 265645650.

The previous prime is 265645649. The next prime is 265645657. The reversal of 265645651 is 156546562.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 265645651 - 2¹ = 265645649 is a prime.

It is a super-2 number, since 2×265645651² = 141135223790427602, which contains 22 as substring.

Together with 265645649, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (265645657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132822825 + 132822826.

It is an arithmetic number, because the mean of its divisors is an integer number (132822826).

Almost surely, 2^265645651 is an apocalyptic number.

265645651 is a deficient number, since it is larger than the sum of its proper divisors (1).

265645651 is an equidigital number, since it uses as much as digits as its factorization.

265645651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216000, while the sum is 40.

The square root of 265645651 is about 16298.6395444528. The cubic root of 265645651 is about 642.8370559109.

The spelling of 265645651 in words is "two hundred sixty-five million, six hundred forty-five thousand, six hundred fifty-one".