6561900098 has 8 divisors (see below), whose sum is σ = 10599992508. Its totient is φ = 3028569264.

The previous prime is 6561900043. The next prime is 6561900101. The reversal of 6561900098 is 8900091656.

It can be written as a sum of positive squares in 2 ways, for example, as 6520078009 + 41822089 = 80747^2 + 6467^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×6561900098² = 86117065792264819208, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126190361 + ... + 126190412.

Almost surely, 2^6561900098 is an apocalyptic number.

6561900098 is a deficient number, since it is larger than the sum of its proper divisors (4038092410).

6561900098 is a wasteful number, since it uses less digits than its factorization.

6561900098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252380788.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 6561900098 is about 81005.5559699457. Note that the first 3 decimals coincide. The cubic root of 6561900098 is about 1872.1610463103.

The spelling of 6561900098 in words is "six billion, five hundred sixty-one million, nine hundred thousand, ninety-eight".