261264667 has 2 divisors, whose sum is σ = 261264668. Its totient is φ = 261264666.

The previous prime is 261264643. The next prime is 261264671. The reversal of 261264667 is 766462162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261264667 - 2¹⁵ = 261231899 is a prime.

It is not a weakly prime, because it can be changed into another prime (261264637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130632333 + 130632334.

It is an arithmetic number, because the mean of its divisors is an integer number (130632334).

Almost surely, 2^261264667 is an apocalyptic number.

261264667 is a deficient number, since it is larger than the sum of its proper divisors (1).

261264667 is an equidigital number, since it uses as much as digits as its factorization.

261264667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 40.

The square root of 261264667 is about 16163.6835838864. The cubic root of 261264667 is about 639.2835953412.

The spelling of 261264667 in words is "two hundred sixty-one million, two hundred sixty-four thousand, six hundred sixty-seven".