1665798051 has 16 divisors (see below), whose sum is σ = 2293910528. Its totient is φ = 1074146400.

The previous prime is 1665798047. The next prime is 1665798073. The reversal of 1665798051 is 1508975661.

It is not a de Polignac number, because 1665798051 - 2² = 1665798047 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1665798031) 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, 245616 + ... + 252306.

It is an arithmetic number, because the mean of its divisors is an integer number (143369408).

Almost surely, 2^1665798051 is an apocalyptic number.

1665798051 is a deficient number, since it is larger than the sum of its proper divisors (628112477).

1665798051 is a wasteful number, since it uses less digits than its factorization.

1665798051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9402.

The product of its (nonzero) digits is 453600, while the sum is 48.

The square root of 1665798051 is about 40814.1893341029. The cubic root of 1665798051 is about 1185.4250941544.

The spelling of 1665798051 in words is "one billion, six hundred sixty-five million, seven hundred ninety-eight thousand, fifty-one".