7455778997 has 4 divisors (see below), whose sum is σ = 7532642796. Its totient is φ = 7378915200.

The previous prime is 7455778991. The next prime is 7455779021. The reversal of 7455778997 is 7998775547.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7998775547 = 7 ⋅1142682221.

It can be written as a sum of positive squares in 2 ways, for example, as 4862830756 + 2592948241 = 69734^2 + 50921^2 .

It is a cyclic number.

It is not a de Polignac number, because 7455778997 - 2³² = 3160811701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7455778991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38431754 + ... + 38431947.

It is an arithmetic number, because the mean of its divisors is an integer number (1883160699).

Almost surely, 2^7455778997 is an apocalyptic number.

It is an amenable number.

7455778997 is a deficient number, since it is larger than the sum of its proper divisors (76863799).

7455778997 is an equidigital number, since it uses as much as digits as its factorization.

7455778997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76863798.

The product of its digits is 155584800, while the sum is 68.

The square root of 7455778997 is about 86346.8528494235. The cubic root of 7455778997 is about 1953.5791375263.

The spelling of 7455778997 in words is "seven billion, four hundred fifty-five million, seven hundred seventy-eight thousand, nine hundred ninety-seven".