16772720638 has 16 divisors (see below), whose sum is σ = 26224721424. Its totient is φ = 8037912960.

The previous prime is 16772720603. The next prime is 16772720683. The reversal of 16772720638 is 83602727761.

It is a happy number.

It is a super-2 number, since 2×16772720638² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16772720591 and 16772720600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1686523 + ... + 1696438.

It is an arithmetic number, because the mean of its divisors is an integer number (1639045089).

Almost surely, 2^16772720638 is an apocalyptic number.

16772720638 is a deficient number, since it is larger than the sum of its proper divisors (9452000786).

16772720638 is a wasteful number, since it uses less digits than its factorization.

16772720638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3383067.

The product of its (nonzero) digits is 1185408, while the sum is 49.

The spelling of 16772720638 in words is "sixteen billion, seven hundred seventy-two million, seven hundred twenty thousand, six hundred thirty-eight".