7155975649 has 9 divisors (see below), whose sum is σ = 7413783897. Its totient is φ = 6906849264.

The previous prime is 7155975641. The next prime is 7155975683. The reversal of 7155975649 is 9465795517.

The square root of 7155975649 is 84593.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 3487493025 + 3668482624 = 59055^2 + 60568^2 .

It is not a de Polignac number, because 7155975649 - 2³ = 7155975641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7155975593 and 7155975602.

It is not an unprimeable number, because it can be changed into a prime (7155975641) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2451739 + ... + 2454655.

Almost surely, 2^7155975649 is an apocalyptic number.

7155975649 is the 84593-rd square number.

7155975649 is the 42297-th centered octagonal number.

It is an amenable number.

7155975649 is a deficient number, since it is larger than the sum of its proper divisors (257808248).

7155975649 is an frugal number, since it uses more digits than its factorization.

7155975649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5892 (or 2946 counting only the distinct ones).

The product of its digits is 11907000, while the sum is 58.

The cubic root of 7155975649 is about 1927.0350681640.

The spelling of 7155975649 in words is "seven billion, one hundred fifty-five million, nine hundred seventy-five thousand, six hundred forty-nine".