261019880398 has 32 divisors (see below), whose sum is σ = 416425082400. Its totient is φ = 122357846016.

The previous prime is 261019880393. The next prime is 261019880441. The reversal of 261019880398 is 893088910162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261019880393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2757438 + ... + 2850526.

It is an arithmetic number, because the mean of its divisors is an integer number (13013283825).

Almost surely, 2^261019880398 is an apocalyptic number.

261019880398 is a deficient number, since it is larger than the sum of its proper divisors (155405202002).

261019880398 is a wasteful number, since it uses less digits than its factorization.

261019880398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93876.

The product of its (nonzero) digits is 1492992, while the sum is 55.

The spelling of 261019880398 in words is "two hundred sixty-one billion, nineteen million, eight hundred eighty thousand, three hundred ninety-eight".