7815922645 has 8 divisors (see below), whose sum is σ = 9385679160. Its totient is φ = 6248356800.

The previous prime is 7815922643. The next prime is 7815922657. The reversal of 7815922645 is 5462295187.

It can be written as a sum of positive squares in 4 ways, for example, as 771006289 + 7044916356 = 27767^2 + 83934^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7815922645 - 2¹ = 7815922643 is a prime.

It is a super-2 number, since 2×7815922645² (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 (7815922643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 539806 + ... + 554095.

It is an arithmetic number, because the mean of its divisors is an integer number (1173209895).

Almost surely, 2^7815922645 is an apocalyptic number.

It is an amenable number.

7815922645 is a deficient number, since it is larger than the sum of its proper divisors (1569756515).

7815922645 is a wasteful number, since it uses less digits than its factorization.

7815922645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095335.

The product of its digits is 1209600, while the sum is 49.

The square root of 7815922645 is about 88407.7069321448. The cubic root of 7815922645 is about 1984.5410385365.

The spelling of 7815922645 in words is "seven billion, eight hundred fifteen million, nine hundred twenty-two thousand, six hundred forty-five".