5166307781 has 4 divisors (see below), whose sum is σ = 5190792864. Its totient is φ = 5141822700.

The previous prime is 5166307777. The next prime is 5166307789. The reversal of 5166307781 is 1877036615.

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 an emirpimes, since its reverse is a distinct semiprime: 1877036615 = 5 ⋅375407323.

It is a cyclic number.

It is not a de Polignac number, because 5166307781 - 2² = 5166307777 is a prime.

It is a super-2 number, since 2×5166307781² = 53381472176042287922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5166307789) 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, 12242225 + ... + 12242646.

It is an arithmetic number, because the mean of its divisors is an integer number (1297698216).

Almost surely, 2^5166307781 is an apocalyptic number.

It is an amenable number.

5166307781 is a deficient number, since it is larger than the sum of its proper divisors (24485083).

5166307781 is a wasteful number, since it uses less digits than its factorization.

5166307781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24485082.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 5166307781 is about 71877.0323608314. The cubic root of 5166307781 is about 1728.7283671987.

The spelling of 5166307781 in words is "five billion, one hundred sixty-six million, three hundred seven thousand, seven hundred eighty-one".