1653650421 has 16 divisors (see below), whose sum is σ = 2237621760. Its totient is φ = 1086080240.

The previous prime is 1653650371. The next prime is 1653650423. The reversal of 1653650421 is 1240563561.

1653650421 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 1653650421 - 2¹⁸ = 1653388277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1653650423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 419566 + ... + 423488.

It is an arithmetic number, because the mean of its divisors is an integer number (139851360).

Almost surely, 2^1653650421 is an apocalyptic number.

It is an amenable number.

1653650421 is a deficient number, since it is larger than the sum of its proper divisors (583971339).

1653650421 is a wasteful number, since it uses less digits than its factorization.

1653650421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5976.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 1653650421 is about 40665.1007744970. The cubic root of 1653650421 is about 1182.5365384047.

The spelling of 1653650421 in words is "one billion, six hundred fifty-three million, six hundred fifty thousand, four hundred twenty-one".