8385477991 has 12 divisors (see below), whose sum is σ = 9222079552. Its totient is φ = 7619040000.

The previous prime is 8385477949. The next prime is 8385478001. The reversal of 8385477991 is 1997745838.

It is not a de Polignac number, because 8385477991 - 2⁹ = 8385477479 is a prime.

It is a super-2 number, since 2×8385477991² (a number of 21 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 (8385477901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 218311 + ... + 253831.

Almost surely, 2^8385477991 is an apocalyptic number.

8385477991 is a deficient number, since it is larger than the sum of its proper divisors (836601561).

8385477991 is a wasteful number, since it uses less digits than its factorization.

8385477991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37494 (or 37483 counting only the distinct ones).

The product of its digits is 15240960, while the sum is 61.

The square root of 8385477991 is about 91572.2555744916. The cubic root of 8385477991 is about 2031.6206000554.

The spelling of 8385477991 in words is "eight billion, three hundred eighty-five million, four hundred seventy-seven thousand, nine hundred ninety-one".