261240250619 has 2 divisors, whose sum is σ = 261240250620. Its totient is φ = 261240250618.

The previous prime is 261240250603. The next prime is 261240250631. The reversal of 261240250619 is 916052042162.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261240250619 - 2⁴ = 261240250603 is a prime.

It is a super-2 number, since 2×261240250619² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (261240270619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130620125309 + 130620125310.

It is an arithmetic number, because the mean of its divisors is an integer number (130620125310).

Almost surely, 2^261240250619 is an apocalyptic number.

261240250619 is a deficient number, since it is larger than the sum of its proper divisors (1).

261240250619 is an equidigital number, since it uses as much as digits as its factorization.

261240250619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 261240250619 in words is "two hundred sixty-one billion, two hundred forty million, two hundred fifty thousand, six hundred nineteen".