1646662745 has 16 divisors (see below), whose sum is σ = 2431994880. Its totient is φ = 1042282944.

The previous prime is 1646662739. The next prime is 1646662747. The reversal of 1646662745 is 5472666461.

It is a cyclic number.

It is not a de Polignac number, because 1646662745 - 2⁴ = 1646662729 is a prime.

It is a super-2 number, since 2×1646662745² = 5422996391541870050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1646662745.

It is not an unprimeable number, because it can be changed into a prime (1646662747) 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, 1809065 + ... + 1809974.

It is an arithmetic number, because the mean of its divisors is an integer number (151999680).

Almost surely, 2^1646662745 is an apocalyptic number.

It is an amenable number.

1646662745 is a deficient number, since it is larger than the sum of its proper divisors (785332135).

1646662745 is a wasteful number, since it uses less digits than its factorization.

1646662745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3619064.

The product of its digits is 1451520, while the sum is 47.

The square root of 1646662745 is about 40579.0924615127. The cubic root of 1646662745 is about 1180.8685420597.

The spelling of 1646662745 in words is "one billion, six hundred forty-six million, six hundred sixty-two thousand, seven hundred forty-five".