2606694781 has 8 divisors (see below), whose sum is σ = 2653478784. Its totient is φ = 2560190640.

The previous prime is 2606694773. The next prime is 2606694791. The reversal of 2606694781 is 1874966062.

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

It is a cyclic number.

It is not a de Polignac number, because 2606694781 - 2³ = 2606694773 is a prime.

It is a super-2 number, since 2×2606694781² = 13589715362585275922, 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 (2606694791) 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, 51126 + ... + 88471.

It is an arithmetic number, because the mean of its divisors is an integer number (331684848).

Almost surely, 2^2606694781 is an apocalyptic number.

It is an amenable number.

2606694781 is a deficient number, since it is larger than the sum of its proper divisors (46784003).

2606694781 is a wasteful number, since it uses less digits than its factorization.

2606694781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139931.

The product of its (nonzero) digits is 870912, while the sum is 49.

The square root of 2606694781 is about 51055.8006596704. The cubic root of 2606694781 is about 1376.2480843607.

The spelling of 2606694781 in words is "two billion, six hundred six million, six hundred ninety-four thousand, seven hundred eighty-one".