261927386425 has 12 divisors (see below), whose sum is σ = 324844702780. Its totient is φ = 209506590720.

The previous prime is 261927386411. The next prime is 261927386429. The reversal of 261927386425 is 524683729162.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 25124469049 + 236802917376 = 158507^2 + 486624^2 .

It is a de Polignac number, because none of the positive numbers 2^k-261927386425 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261927386429) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 731160 + ... + 1028809.

Almost surely, 2^261927386425 is an apocalyptic number.

261927386425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261927386425 is a deficient number, since it is larger than the sum of its proper divisors (62917316355).

261927386425 is a wasteful number, since it uses less digits than its factorization.

261927386425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1765932 (or 1765927 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 55.

The spelling of 261927386425 in words is "two hundred sixty-one billion, nine hundred twenty-seven million, three hundred eighty-six thousand, four hundred twenty-five".