7953261985 has 8 divisors (see below), whose sum is σ = 9558807336. Its totient is φ = 6352680960.

The previous prime is 7953261973. The next prime is 7953261989. The reversal of 7953261985 is 5891623597.

It can be written as a sum of positive squares in 4 ways, for example, as 2257390144 + 5695871841 = 47512^2 + 75471^2 .

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

It is not a de Polignac number, because 7953261985 - 2⁷ = 7953261857 is a prime.

It is a super-2 number, since 2×7953261985² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7953261989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1237554 + ... + 1243963.

It is an arithmetic number, because the mean of its divisors is an integer number (1194850917).

Almost surely, 2^7953261985 is an apocalyptic number.

It is an amenable number.

7953261985 is a deficient number, since it is larger than the sum of its proper divisors (1605545351).

7953261985 is a wasteful number, since it uses less digits than its factorization.

7953261985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2482163.

The product of its digits is 4082400, while the sum is 55.

The square root of 7953261985 is about 89181.0629281800. The cubic root of 7953261985 is about 1996.0975558340.

The spelling of 7953261985 in words is "seven billion, nine hundred fifty-three million, two hundred sixty-one thousand, nine hundred eighty-five".