991626983446 has 48 divisors (see below), whose sum is σ = 1670498247600. Its totient is φ = 441031060800.

The previous prime is 991626983393. The next prime is 991626983447. The reversal of 991626983446 is 644389626199.

991626983446 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (67).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991626983447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2210656 + ... + 2621116.

It is an arithmetic number, because the mean of its divisors is an integer number (34802046825).

Almost surely, 2^991626983446 is an apocalyptic number.

991626983446 is a deficient number, since it is larger than the sum of its proper divisors (678871264154).

991626983446 is a wasteful number, since it uses less digits than its factorization.

991626983446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410701 (or 410690 counting only the distinct ones).

The product of its digits is 120932352, while the sum is 67.

The spelling of 991626983446 in words is "nine hundred ninety-one billion, six hundred twenty-six million, nine hundred eighty-three thousand, four hundred forty-six".