1653521444 has 12 divisors (see below), whose sum is σ = 2894064768. Its totient is φ = 826645800.

The previous prime is 1653521437. The next prime is 1653521459. The reversal of 1653521444 is 4441253561.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9209 + ... + 58239.

It is an arithmetic number, because the mean of its divisors is an integer number (241172064).

Almost surely, 2^1653521444 is an apocalyptic number.

It is an amenable number.

1653521444 is a deficient number, since it is larger than the sum of its proper divisors (1240543324).

1653521444 is a wasteful number, since it uses less digits than its factorization.

1653521444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57466 (or 57464 counting only the distinct ones).

The product of its digits is 57600, while the sum is 35.

The square root of 1653521444 is about 40663.5148997231. The cubic root of 1653521444 is about 1182.5057934986.

The spelling of 1653521444 in words is "one billion, six hundred fifty-three million, five hundred twenty-one thousand, four hundred forty-four".