4661821653 has 4 divisors (see below), whose sum is σ = 6215762208. Its totient is φ = 3107881100.

The previous prime is 4661821621. The next prime is 4661821699. The reversal of 4661821653 is 3561281664.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4661821653 - 2⁵ = 4661821621 is a prime.

It is a super-2 number, since 2×4661821653² = 43465162248759304818, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4661823653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 776970273 + ... + 776970278.

It is an arithmetic number, because the mean of its divisors is an integer number (1553940552).

Almost surely, 2^4661821653 is an apocalyptic number.

It is an amenable number.

4661821653 is a deficient number, since it is larger than the sum of its proper divisors (1553940555).

4661821653 is a wasteful number, since it uses less digits than its factorization.

4661821653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1553940554.

The product of its digits is 207360, while the sum is 42.

The square root of 4661821653 is about 68277.5340284050. The cubic root of 4661821653 is about 1670.5207900409.

The spelling of 4661821653 in words is "four billion, six hundred sixty-one million, eight hundred twenty-one thousand, six hundred fifty-three".