7001878661 has 8 divisors (see below), whose sum is σ = 7313285184. Its totient is φ = 6691053600.

The previous prime is 7001878633. The next prime is 7001878691. The reversal of 7001878661 is 1668781007.

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-7001878661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7001878691) 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, 120656 + ... + 169001.

It is an arithmetic number, because the mean of its divisors is an integer number (914160648).

Almost surely, 2^7001878661 is an apocalyptic number.

It is an amenable number.

7001878661 is a deficient number, since it is larger than the sum of its proper divisors (311406523).

7001878661 is a wasteful number, since it uses less digits than its factorization.

7001878661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290731.

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 7001878661 is about 83677.2290470950. The cubic root of 7001878661 is about 1913.1022983800.

The spelling of 7001878661 in words is "seven billion, one million, eight hundred seventy-eight thousand, six hundred sixty-one".