661075098 has 16 divisors (see below), whose sum is σ = 1335242016. Its totient is φ = 218176400.

The previous prime is 661075091. The next prime is 661075099. The reversal of 661075098 is 890570166.

It is not an unprimeable number, because it can be changed into a prime (661075091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 544836 + ... + 546047.

It is an arithmetic number, because the mean of its divisors is an integer number (83452626).

Almost surely, 2^661075098 is an apocalyptic number.

661075098 is an abundant number, since it is smaller than the sum of its proper divisors (674166918).

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

661075098 is a wasteful number, since it uses less digits than its factorization.

661075098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090989.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 661075098 is about 25711.3807097169. The cubic root of 661075098 is about 871.1312618997.

The spelling of 661075098 in words is "six hundred sixty-one million, seventy-five thousand, ninety-eight".