261973900098 has 48 divisors (see below), whose sum is σ = 588491163000. Its totient is φ = 84125583360.

The previous prime is 261973900073. The next prime is 261973900121. The reversal of 261973900098 is 890009379162.

It can be written as a sum of positive squares in 4 ways, for example, as 240504910569 + 21468989529 = 490413^2 + 146523^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 324493 + ... + 793248.

Almost surely, 2^261973900098 is an apocalyptic number.

261973900098 is an abundant number, since it is smaller than the sum of its proper divisors (326517262902).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261973900098 is a wasteful number, since it uses less digits than its factorization.

261973900098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1118227 (or 1118224 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The spelling of 261973900098 in words is "two hundred sixty-one billion, nine hundred seventy-three million, nine hundred thousand, ninety-eight".