8125620815 has 24 divisors (see below), whose sum is σ = 11154857280. Its totient is φ = 5647477248.

The previous prime is 8125620743. The next prime is 8125620817. The reversal of 8125620815 is 5180265218.

It is not a de Polignac number, because 8125620815 - 2¹⁶ = 8125555279 is a prime.

It is a super-2 number, since 2×8125620815² (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 (8125620817) 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, 197495 + ... + 235064.

It is an arithmetic number, because the mean of its divisors is an integer number (464785720).

Almost surely, 2^8125620815 is an apocalyptic number.

8125620815 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

8125620815 is a deficient number, since it is larger than the sum of its proper divisors (3029236465).

8125620815 is a wasteful number, since it uses less digits than its factorization.

8125620815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432611 (or 432594 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 38.

The square root of 8125620815 is about 90142.2254828446. The cubic root of 8125620815 is about 2010.4140805928.

The spelling of 8125620815 in words is "eight billion, one hundred twenty-five million, six hundred twenty thousand, eight hundred fifteen".