490000207661 has 8 divisors (see below), whose sum is σ = 501022184184. Its totient is φ = 479044034560.

The previous prime is 490000207513. The next prime is 490000207663. The reversal of 490000207661 is 166702000094.

It can be written as a sum of positive squares in 4 ways, for example, as 181364405161 + 308635802500 = 425869^2 + 555550^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 490000207661 - 2²⁶ = 489933098797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (490000207663) 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, 16435796 + ... + 16465581.

It is an arithmetic number, because the mean of its divisors is an integer number (62627773023).

Almost surely, 2^490000207661 is an apocalyptic number.

It is an amenable number.

490000207661 is a deficient number, since it is larger than the sum of its proper divisors (11021976523).

490000207661 is a wasteful number, since it uses less digits than its factorization.

490000207661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32901711.

The product of its (nonzero) digits is 18144, while the sum is 35.

The spelling of 490000207661 in words is "four hundred ninety billion, two hundred seven thousand, six hundred sixty-one".