1670438565 has 32 divisors (see below), whose sum is σ = 3065472000. Its totient is φ = 862159680.

The previous prime is 1670438543. The next prime is 1670438591. The reversal of 1670438565 is 5658340761.

1670438565 is a `hidden beast` number, since 16 + 70 + 4 + 3 + 8 + 565 = 666.

It is not a de Polignac number, because 1670438565 - 2⁵ = 1670438533 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1670438565.

It is a congruent number.

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, 195390 + ... + 203759.

It is an arithmetic number, because the mean of its divisors is an integer number (95796000).

Almost surely, 2^1670438565 is an apocalyptic number.

1670438565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1670438565 is a deficient number, since it is larger than the sum of its proper divisors (1395033435).

1670438565 is a wasteful number, since it uses less digits than its factorization.

1670438565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399194 (or 399188 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The square root of 1670438565 is about 40870.9990702454. Note that the first 3 decimals coincide. The cubic root of 1670438565 is about 1186.5248436096.

The spelling of 1670438565 in words is "one billion, six hundred seventy million, four hundred thirty-eight thousand, five hundred sixty-five".