2142661797 has 6 divisors (see below), whose sum is σ = 3094955942. Its totient is φ = 1428441192.

The previous prime is 2142661777. The next prime is 2142661799. The reversal of 2142661797 is 7971662412.

2142661797 is a `hidden beast` number, since 2 + 1 + 4 + 26 + 617 + 9 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2134994436 + 7667361 = 46206^2 + 2769^2 .

It is not a de Polignac number, because 2142661797 - 2¹¹ = 2142659749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2142661799) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 119036758 + ... + 119036775.

Almost surely, 2^2142661797 is an apocalyptic number.

It is an amenable number.

2142661797 is a deficient number, since it is larger than the sum of its proper divisors (952294145).

2142661797 is a wasteful number, since it uses less digits than its factorization.

2142661797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238073539 (or 238073536 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 2142661797 is about 46288.8949641272. The cubic root of 2142661797 is about 1289.1928121344.

The spelling of 2142661797 in words is "two billion, one hundred forty-two million, six hundred sixty-one thousand, seven hundred ninety-seven".