261250265998 has 16 divisors (see below), whose sum is σ = 405519858000. Its totient is φ = 126079902592.

The previous prime is 261250265977. The next prime is 261250266023. The reversal of 261250265998 is 899562052162.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 549928 + ... + 908251.

It is an arithmetic number, because the mean of its divisors is an integer number (25344991125).

Almost surely, 2^261250265998 is an apocalyptic number.

261250265998 is a deficient number, since it is larger than the sum of its proper divisors (144269592002).

261250265998 is a wasteful number, since it uses less digits than its factorization.

261250265998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1461299.

The product of its (nonzero) digits is 4665600, while the sum is 55.

The spelling of 261250265998 in words is "two hundred sixty-one billion, two hundred fifty million, two hundred sixty-five thousand, nine hundred ninety-eight".