988245661 has 4 divisors (see below), whose sum is σ = 1064264572. Its totient is φ = 912226752.

The previous prime is 988245647. The next prime is 988245703. The reversal of 988245661 is 166542889.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166542889 = 97 ⋅1716937.

It can be written as a sum of positive squares in 2 ways, for example, as 139688761 + 848556900 = 11819^2 + 29130^2 .

It is a cyclic number.

It is not a de Polignac number, because 988245661 - 2¹⁹ = 987721373 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 (988245161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38009436 + ... + 38009461.

It is an arithmetic number, because the mean of its divisors is an integer number (266066143).

Almost surely, 2^988245661 is an apocalyptic number.

It is an amenable number.

988245661 is a deficient number, since it is larger than the sum of its proper divisors (76018911).

988245661 is a wasteful number, since it uses less digits than its factorization.

988245661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76018910.

The product of its digits is 829440, while the sum is 49.

The square root of 988245661 is about 31436.3748069016. The cubic root of 988245661 is about 996.0664343492.

The spelling of 988245661 in words is "nine hundred eighty-eight million, two hundred forty-five thousand, six hundred sixty-one".