991766654 has 8 divisors (see below), whose sum is σ = 1496777160. Its totient is φ = 492840936.

The previous prime is 991766651. The next prime is 991766669. The reversal of 991766654 is 456667199.

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

It is a super-3 number, since 3×991766654³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 991766596 and 991766605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991766651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1520789 + ... + 1521440.

It is an arithmetic number, because the mean of its divisors is an integer number (187097145).

Almost surely, 2^991766654 is an apocalyptic number.

991766654 is a deficient number, since it is larger than the sum of its proper divisors (505010506).

991766654 is a wasteful number, since it uses less digits than its factorization.

991766654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3042394.

The product of its digits is 2449440, while the sum is 53.

The square root of 991766654 is about 31492.3269067244. The cubic root of 991766654 is about 997.2479846926.

The spelling of 991766654 in words is "nine hundred ninety-one million, seven hundred sixty-six thousand, six hundred fifty-four".