16721253507 has 8 divisors (see below), whose sum is σ = 25480005376. Its totient is φ = 9555001992.

The previous prime is 16721253503. The next prime is 16721253511. The reversal of 16721253507 is 70535212761.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (16721253503) and next prime (16721253511).

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

It is not a de Polignac number, because 16721253507 - 2² = 16721253503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16721253503) 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, 398125063 + ... + 398125104.

It is an arithmetic number, because the mean of its divisors is an integer number (3185000672).

Almost surely, 2^16721253507 is an apocalyptic number.

16721253507 is a deficient number, since it is larger than the sum of its proper divisors (8758751869).

16721253507 is an equidigital number, since it uses as much as digits as its factorization.

16721253507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796250177.

The product of its (nonzero) digits is 88200, while the sum is 39.

The spelling of 16721253507 in words is "sixteen billion, seven hundred twenty-one million, two hundred fifty-three thousand, five hundred seven".