1664077365 has 64 divisors (see below), whose sum is σ = 3092121600. Its totient is φ = 858703680.

The previous prime is 1664077357. The next prime is 1664077403. The reversal of 1664077365 is 5637704661.

It is not a de Polignac number, because 1664077365 - 2³ = 1664077357 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 1664077365.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 336531 + ... + 341439.

It is an arithmetic number, because the mean of its divisors is an integer number (48314400).

Almost surely, 2^1664077365 is an apocalyptic number.

1664077365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1664077365 is a deficient number, since it is larger than the sum of its proper divisors (1428044235).

1664077365 is an frugal number, since it uses more digits than its factorization.

1664077365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4966 (or 4948 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 45.

The square root of 1664077365 is about 40793.1043805200. The cubic root of 1664077365 is about 1185.0167919428.

The spelling of 1664077365 in words is "one billion, six hundred sixty-four million, seventy-seven thousand, three hundred sixty-five".