1645155465 has 32 divisors (see below), whose sum is σ = 2652470400. Its totient is φ = 870704640.

The previous prime is 1645155443. The next prime is 1645155497. The reversal of 1645155465 is 5645515461.

It is not a de Polignac number, because 1645155465 - 2⁶ = 1645155401 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1404330 + ... + 1405500.

It is an arithmetic number, because the mean of its divisors is an integer number (82889700).

Almost surely, 2^1645155465 is an apocalyptic number.

1645155465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1645155465 is a deficient number, since it is larger than the sum of its proper divisors (1007314935).

1645155465 is a wasteful number, since it uses less digits than its factorization.

1645155465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1817.

The product of its digits is 360000, while the sum is 42.

The square root of 1645155465 is about 40560.5160839948. The cubic root of 1645155465 is about 1180.5081276604.

The spelling of 1645155465 in words is "one billion, six hundred forty-five million, one hundred fifty-five thousand, four hundred sixty-five".