6660857951 has 4 divisors (see below), whose sum is σ = 7266390504. Its totient is φ = 6055325400.

The previous prime is 6660857933. The next prime is 6660858013. The reversal of 6660857951 is 1597580666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6660857951 - 2²² = 6656663647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6660857893 and 6660857902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6660857551) 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, 302766260 + ... + 302766281.

It is an arithmetic number, because the mean of its divisors is an integer number (1816597626).

Almost surely, 2^6660857951 is an apocalyptic number.

6660857951 is a deficient number, since it is larger than the sum of its proper divisors (605532553).

6660857951 is a wasteful number, since it uses less digits than its factorization.

6660857951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605532552.

The product of its (nonzero) digits is 2721600, while the sum is 53.

The square root of 6660857951 is about 81614.0793674719. The cubic root of 6660857951 is about 1881.5252778545.

The spelling of 6660857951 in words is "six billion, six hundred sixty million, eight hundred fifty-seven thousand, nine hundred fifty-one".