987654226691 has 8 divisors (see below), whose sum is σ = 1124286234624. Its totient is φ = 858829762120.

The previous prime is 987654226609. The next prime is 987654226711. The reversal of 987654226691 is 196622456789.

987654226691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 987654226691 - 2²² = 987650032387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (987654256691) 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, 1951885571 + ... + 1951886076.

It is an arithmetic number, because the mean of its divisors is an integer number (140535779328).

Almost surely, 2^987654226691 is an apocalyptic number.

987654226691 is a deficient number, since it is larger than the sum of its proper divisors (136632007933).

987654226691 is a wasteful number, since it uses less digits than its factorization.

987654226691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3903771681.

The product of its digits is 78382080, while the sum is 65.

The spelling of 987654226691 in words is "nine hundred eighty-seven billion, six hundred fifty-four million, two hundred twenty-six thousand, six hundred ninety-one".