988876661 has 4 divisors (see below), whose sum is σ = 989161824. Its totient is φ = 988591500.

The previous prime is 988876649. The next prime is 988876699. The reversal of 988876661 is 166678889.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-988876661 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 988876661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (988876631) 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, 137315 + ... + 144336.

It is an arithmetic number, because the mean of its divisors is an integer number (247290456).

Almost surely, 2^988876661 is an apocalyptic number.

It is an amenable number.

988876661 is a deficient number, since it is larger than the sum of its proper divisors (285163).

988876661 is a wasteful number, since it uses less digits than its factorization.

988876661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285162.

The product of its digits is 6967296, while the sum is 59.

The square root of 988876661 is about 31446.4093498765. The cubic root of 988876661 is about 996.2783871128.

The spelling of 988876661 in words is "nine hundred eighty-eight million, eight hundred seventy-six thousand, six hundred sixty-one".