1621160471444 has 24 divisors (see below), whose sum is σ = 2871612210600. Its totient is φ = 800717012480.

The previous prime is 1621160471429. The next prime is 1621160471471. The reversal of 1621160471444 is 4441740611261.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 232769581444 + 1388390890000 = 482462^2 + 1178300^2 .

It is a super-2 number, since 2×1621160471444² (a number of 25 digits) contains 22 as substring.

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, 1768289 + ... + 2523720.

It is an arithmetic number, because the mean of its divisors is an integer number (119650508775).

Almost surely, 2^{1621160471444} is an apocalyptic number.

It is an amenable number.

1621160471444 is a deficient number, since it is larger than the sum of its proper divisors (1250451739156).

1621160471444 is a wasteful number, since it uses less digits than its factorization.

1621160471444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4293163 (or 4293161 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The spelling of 1621160471444 in words is "one trillion, six hundred twenty-one billion, one hundred sixty million, four hundred seventy-one thousand, four hundred forty-four".