9942565678 has 4 divisors (see below), whose sum is σ = 14913848520. Its totient is φ = 4971282838.

The previous prime is 9942565657. The next prime is 9942565679. The reversal of 9942565678 is 8765652499.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8765652499 = 37 ⋅236909527.

It is a super-2 number, since 2×9942565678² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9942565679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2485641418 + ... + 2485641421.

It is an arithmetic number, because the mean of its divisors is an integer number (3728462130).

Almost surely, 2^9942565678 is an apocalyptic number.

9942565678 is a deficient number, since it is larger than the sum of its proper divisors (4971282842).

9942565678 is a wasteful number, since it uses less digits than its factorization.

9942565678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4971282841.

The product of its digits is 32659200, while the sum is 61.

The square root of 9942565678 is about 99712.4148639476. The cubic root of 9942565678 is about 2150.3021517300.

The spelling of 9942565678 in words is "nine billion, nine hundred forty-two million, five hundred sixty-five thousand, six hundred seventy-eight".