1866795061 has 4 divisors (see below), whose sum is σ = 1866893824. Its totient is φ = 1866696300.

The previous prime is 1866795053. The next prime is 1866795083. The reversal of 1866795061 is 1605976681.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1605976681 = 3461 ⋅464021.

It is a cyclic number.

It is not a de Polignac number, because 1866795061 - 2³ = 1866795053 is a prime.

It is a super-3 number, since 3×1866795061³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1866794996 and 1866795014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866795001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11175 + ... + 62116.

It is an arithmetic number, because the mean of its divisors is an integer number (466723456).

Almost surely, 2^1866795061 is an apocalyptic number.

It is an amenable number.

1866795061 is a deficient number, since it is larger than the sum of its proper divisors (98763).

1866795061 is an equidigital number, since it uses as much as digits as its factorization.

1866795061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98762.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 1866795061 is about 43206.4238395172. The cubic root of 1866795061 is about 1231.3047298166.

The spelling of 1866795061 in words is "one billion, eight hundred sixty-six million, seven hundred ninety-five thousand, sixty-one".