1645408461 has 32 divisors (see below), whose sum is σ = 2373148800. Its totient is φ = 1010257920.

The previous prime is 1645408451. The next prime is 1645408489. The reversal of 1645408461 is 1648045461.

It is not a de Polignac number, because 1645408461 - 2¹⁸ = 1645146317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645408411) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 724035 + ... + 726303.

It is an arithmetic number, because the mean of its divisors is an integer number (74160900).

Almost surely, 2^1645408461 is an apocalyptic number.

It is an amenable number.

1645408461 is a deficient number, since it is larger than the sum of its proper divisors (727740339).

1645408461 is a wasteful number, since it uses less digits than its factorization.

1645408461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2589.

The product of its (nonzero) digits is 92160, while the sum is 39.

The square root of 1645408461 is about 40563.6347114013. The cubic root of 1645408461 is about 1180.5686383603.

The spelling of 1645408461 in words is "one billion, six hundred forty-five million, four hundred eight thousand, four hundred sixty-one".