997622978105 has 24 divisors (see below), whose sum is σ = 1310885049240. Its totient is φ = 728428546560.

The previous prime is 997622978083. The next prime is 997622978137. The reversal of 997622978105 is 501879226799.

It can be written as a sum of positive squares in 12 ways, for example, as 875729126416 + 121893851689 = 935804^2 + 349133^2 .

It is not a de Polignac number, because 997622978105 - 2⁶ = 997622978041 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6557486 + ... + 6707895.

It is an arithmetic number, because the mean of its divisors is an integer number (54620210385).

Almost surely, 2^997622978105 is an apocalyptic number.

It is an amenable number.

997622978105 is a deficient number, since it is larger than the sum of its proper divisors (313262071135).

997622978105 is a wasteful number, since it uses less digits than its factorization.

997622978105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13265501 (or 13265488 counting only the distinct ones).

The product of its (nonzero) digits is 34292160, while the sum is 65.

The spelling of 997622978105 in words is "nine hundred ninety-seven billion, six hundred twenty-two million, nine hundred seventy-eight thousand, one hundred five".