1651375341666 has 24 divisors (see below), whose sum is σ = 3578022023004. Its totient is φ = 550451967840.

The previous prime is 1651375341661. The next prime is 1651375341713. The reversal of 1651375341666 is 6661435731561.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1645075586025 + 6299755641 = 1282605^2 + 79371^2 .

It is not an unprimeable number, because it can be changed into a prime (1651375341661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1179756 + ... + 2166696.

Almost surely, 2^{1651375341666} is an apocalyptic number.

1651375341666 is an abundant number, since it is smaller than the sum of its proper divisors (1926646681338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1651375341666 is a wasteful number, since it uses less digits than its factorization.

1651375341666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079906 (or 1079903 counting only the distinct ones).

The product of its digits is 8164800, while the sum is 54.

The spelling of 1651375341666 in words is "one trillion, six hundred fifty-one billion, three hundred seventy-five million, three hundred forty-one thousand, six hundred sixty-six".