1600632355921 has 27 divisors (see below), whose sum is σ = 1700668932123. Its totient is φ = 1506351293040.

The previous prime is 1600632355909. The next prime is 1600632355943. The reversal of 1600632355921 is 1295532360061.

The square root of 1600632355921 is 1265161.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 437038665921 + 1163593690000 = 661089^2 + 1078700^2 .

It is not a de Polignac number, because 1600632355921 - 2⁷ = 1600632355793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1600632335921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1949612691 + ... + 1949613511.

Almost surely, 2^{1600632355921} is an apocalyptic number.

1600632355921 is the 1265161-st square number.

1600632355921 is the 632581-st centered octagonal number.

It is an amenable number.

1600632355921 is a deficient number, since it is larger than the sum of its proper divisors (100036576202).

1600632355921 is an frugal number, since it uses more digits than its factorization.

1600632355921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1822 (or 911 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 43.

The spelling of 1600632355921 in words is "one trillion, six hundred billion, six hundred thirty-two million, three hundred fifty-five thousand, nine hundred twenty-one".