1642165645 has 16 divisors (see below), whose sum is σ = 2007555840. Its totient is φ = 1289242944.

The previous prime is 1642165633. The next prime is 1642165667. The reversal of 1642165645 is 5465612461.

1642165645 = T₁₃₄ + T₁₃₅ + ... + T₂₁₄₃.

It is not a de Polignac number, because 1642165645 - 2¹⁹ = 1641641357 is a prime.

It is a super-3 number, since 3×1642165645³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1642165598 and 1642165607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81004 + ... + 99226.

It is an arithmetic number, because the mean of its divisors is an integer number (125472240).

Almost surely, 2^1642165645 is an apocalyptic number.

It is an amenable number.

1642165645 is a deficient number, since it is larger than the sum of its proper divisors (365390195).

1642165645 is a wasteful number, since it uses less digits than its factorization.

1642165645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18564.

The product of its digits is 172800, while the sum is 40.

The square root of 1642165645 is about 40523.6430371209. The cubic root of 1642165645 is about 1179.7925626453.

The spelling of 1642165645 in words is "one billion, six hundred forty-two million, one hundred sixty-five thousand, six hundred forty-five".