2685475781 has 8 divisors (see below), whose sum is σ = 2792342784. Its totient is φ = 2579873760.

The previous prime is 2685475757. The next prime is 2685475787. The reversal of 2685475781 is 1875745862.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2685475781 is a prime.

It is a super-2 number, since 2×2685475781² = 14423560340675119922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2685475787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 311915 + ... + 320408.

It is an arithmetic number, because the mean of its divisors is an integer number (349042848).

Almost surely, 2^2685475781 is an apocalyptic number.

It is an amenable number.

2685475781 is a deficient number, since it is larger than the sum of its proper divisors (106867003).

2685475781 is a wasteful number, since it uses less digits than its factorization.

2685475781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632491.

The product of its digits is 3763200, while the sum is 53.

The square root of 2685475781 is about 51821.5764040424. The cubic root of 2685475781 is about 1389.9752908673.

The spelling of 2685475781 in words is "two billion, six hundred eighty-five million, four hundred seventy-five thousand, seven hundred eighty-one".