1645162905 has 16 divisors (see below), whose sum is σ = 2643563520. Its totient is φ = 873652608.

The previous prime is 1645162867. The next prime is 1645162907. The reversal of 1645162905 is 5092615461.

It is not a de Polignac number, because 1645162905 - 2¹¹ = 1645160857 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1645162907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 231865 + ... + 238854.

It is an arithmetic number, because the mean of its divisors is an integer number (165222720).

Almost surely, 2^1645162905 is an apocalyptic number.

1645162905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1645162905 is a deficient number, since it is larger than the sum of its proper divisors (998400615).

1645162905 is a wasteful number, since it uses less digits than its factorization.

1645162905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470960.

The product of its (nonzero) digits is 64800, while the sum is 39.

The square root of 1645162905 is about 40560.6077987005. The cubic root of 1645162905 is about 1180.5099072222.

The spelling of 1645162905 in words is "one billion, six hundred forty-five million, one hundred sixty-two thousand, nine hundred five".