7854420561781 has 8 divisors (see below), whose sum is σ = 7902434584800. Its totient is φ = 7806545912880.

The previous prime is 7854420561707. The next prime is 7854420561937. The reversal of 7854420561781 is 1871650244587.

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-7854420561781 is a prime.

It is a super-2 number, since 2×7854420561781² (a number of 27 digits) 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 (7854420661781) 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, 34730475 + ... + 34955896.

It is an arithmetic number, because the mean of its divisors is an integer number (987804323100).

Almost surely, 2^{7854420561781} is an apocalyptic number.

It is an amenable number.

7854420561781 is a deficient number, since it is larger than the sum of its proper divisors (48014023019).

7854420561781 is a wasteful number, since it uses less digits than its factorization.

7854420561781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69687059.

The product of its (nonzero) digits is 15052800, while the sum is 58.

The spelling of 7854420561781 in words is "seven trillion, eight hundred fifty-four billion, four hundred twenty million, five hundred sixty-one thousand, seven hundred eighty-one".