1642465621 has 8 divisors (see below), whose sum is σ = 1733274080. Its totient is φ = 1552093488.

The previous prime is 1642465609. The next prime is 1642465637. The reversal of 1642465621 is 1265642461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1642465621 - 2¹³ = 1642457429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642465681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101331 + ... + 116416.

It is an arithmetic number, because the mean of its divisors is an integer number (216659260).

Almost surely, 2^1642465621 is an apocalyptic number.

It is an amenable number.

1642465621 is a deficient number, since it is larger than the sum of its proper divisors (90808459).

1642465621 is a wasteful number, since it uses less digits than its factorization.

1642465621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218163.

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

The square root of 1642465621 is about 40527.3441148072. The cubic root of 1642465621 is about 1179.8643962242.

The spelling of 1642465621 in words is "one billion, six hundred forty-two million, four hundred sixty-five thousand, six hundred twenty-one".