4642251661 has 4 divisors (see below), whose sum is σ = 4659903072. Its totient is φ = 4624600252.

The previous prime is 4642251637. The next prime is 4642251671. The reversal of 4642251661 is 1661522464.

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 4642251661 - 2¹⁹ = 4641727373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4642251661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4642251611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8825311 + ... + 8825836.

It is an arithmetic number, because the mean of its divisors is an integer number (1164975768).

Almost surely, 2^4642251661 is an apocalyptic number.

It is an amenable number.

4642251661 is a deficient number, since it is larger than the sum of its proper divisors (17651411).

4642251661 is a wasteful number, since it uses less digits than its factorization.

4642251661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17651410.

The product of its digits is 69120, while the sum is 37.

The square root of 4642251661 is about 68134.0712199117. The cubic root of 4642251661 is about 1668.1799360248.

The spelling of 4642251661 in words is "four billion, six hundred forty-two million, two hundred fifty-one thousand, six hundred sixty-one".