3640340665 has 16 divisors (see below), whose sum is σ = 4706182656. Its totient is φ = 2687256000.

The previous prime is 3640340659. The next prime is 3640340699. The reversal of 3640340665 is 5660430463.

It is not a de Polignac number, because 3640340665 - 2⁹ = 3640340153 is a prime.

It is a Duffinian 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, 198640 + ... + 216190.

It is an arithmetic number, because the mean of its divisors is an integer number (294136416).

Almost surely, 2^3640340665 is an apocalyptic number.

It is an amenable number.

3640340665 is a deficient number, since it is larger than the sum of its proper divisors (1065841991).

3640340665 is a wasteful number, since it uses less digits than its factorization.

3640340665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20760.

The product of its (nonzero) digits is 155520, while the sum is 37.

The square root of 3640340665 is about 60335.2356836368. The cubic root of 3640340665 is about 1538.3223233647.

The spelling of 3640340665 in words is "three billion, six hundred forty million, three hundred forty thousand, six hundred sixty-five".