261220389090 has 32 divisors (see below), whose sum is σ = 628026924096. Its totient is φ = 69536771520.

The previous prime is 261220389043. The next prime is 261220389103. The reversal of 261220389090 is 90983022162.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7607517 + ... + 7641776.

It is an arithmetic number, because the mean of its divisors is an integer number (19625841378).

Almost surely, 2^261220389090 is an apocalyptic number.

261220389090 is an abundant number, since it is smaller than the sum of its proper divisors (366806535006).

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

261220389090 is a wasteful number, since it uses less digits than its factorization.

261220389090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15249874.

The product of its (nonzero) digits is 93312, while the sum is 42.

The spelling of 261220389090 in words is "two hundred sixty-one billion, two hundred twenty million, three hundred eighty-nine thousand, ninety".