16997297640 has 32 divisors (see below), whose sum is σ = 50991893280. Its totient is φ = 4532612672.

The previous prime is 16997297633. The next prime is 16997297641. The reversal of 16997297640 is 4679279961.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is not an unprimeable number, because it can be changed into a prime (16997297641) 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, 70821954 + ... + 70822193.

It is an arithmetic number, because the mean of its divisors is an integer number (1593496665).

Almost surely, 2^16997297640 is an apocalyptic number.

16997297640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16997297640 is an abundant number, since it is smaller than the sum of its proper divisors (33994595640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16997297640 is a wasteful number, since it uses less digits than its factorization.

16997297640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141644161 (or 141644157 counting only the distinct ones).

The product of its (nonzero) digits is 10287648, while the sum is 60.

The spelling of 16997297640 in words is "sixteen billion, nine hundred ninety-seven million, two hundred ninety-seven thousand, six hundred forty".