1621165642 has 8 divisors (see below), whose sum is σ = 2483487936. Its totient is φ = 793336332.

The previous prime is 1621165613. The next prime is 1621165681. The reversal of 1621165642 is 2465611261.

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

It is a junction number, because it is equal to n+sod(n) for n = 1621165598 and 1621165607.

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, 8623128 + ... + 8623315.

It is an arithmetic number, because the mean of its divisors is an integer number (310435992).

Almost surely, 2^1621165642 is an apocalyptic number.

1621165642 is a deficient number, since it is larger than the sum of its proper divisors (862322294).

1621165642 is a wasteful number, since it uses less digits than its factorization.

1621165642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17246492.

The product of its digits is 17280, while the sum is 34.

The square root of 1621165642 is about 40263.7012953355. The cubic root of 1621165642 is about 1174.7419121097.

The spelling of 1621165642 in words is "one billion, six hundred twenty-one million, one hundred sixty-five thousand, six hundred forty-two".