16721600740 has 24 divisors (see below), whose sum is σ = 37816543800. Its totient is φ = 6174129408.

The previous prime is 16721600723. The next prime is 16721600747. The reversal of 16721600740 is 4700612761.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2465718336 + 14255882404 = 49656^2 + 119398^2 .

It is a super-2 number, since 2×16721600740² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16721600696 and 16721600705.

It is not an unprimeable number, because it can be changed into a prime (16721600747) 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, 32156665 + ... + 32157184.

It is an arithmetic number, because the mean of its divisors is an integer number (1575689325).

Almost surely, 2^16721600740 is an apocalyptic number.

16721600740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16721600740 is an abundant number, since it is smaller than the sum of its proper divisors (21094943060).

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

16721600740 is a wasteful number, since it uses less digits than its factorization.

16721600740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64313871 (or 64313869 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 34.

The spelling of 16721600740 in words is "sixteen billion, seven hundred twenty-one million, six hundred thousand, seven hundred forty".