9515163978 has 48 divisors (see below), whose sum is σ = 21391810440. Its totient is φ = 3054163968.

The previous prime is 9515163971. The next prime is 9515164003. The reversal of 9515163978 is 8793615159.

9515163978 is a `hidden beast` number, since 9 + 51 + 516 + 3 + 9 + 78 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 9297394929 + 217769049 = 96423^2 + 14757^2 .

It is a super-4 number, since 4×9515163978⁴ (a number of 41 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (9515163971) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9043 + ... + 138246.

Almost surely, 2^9515163978 is an apocalyptic number.

9515163978 is an abundant number, since it is smaller than the sum of its proper divisors (11876646462).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9515163978 is a wasteful number, since it uses less digits than its factorization.

9515163978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147431 (or 147428 counting only the distinct ones).

The product of its digits is 2041200, while the sum is 54.

The square root of 9515163978 is about 97545.7019965513. The cubic root of 9515163978 is about 2119.0380691462.

The spelling of 9515163978 in words is "nine billion, five hundred fifteen million, one hundred sixty-three thousand, nine hundred seventy-eight".