7758138049 has 4 divisors (see below), whose sum is σ = 7923204864. Its totient is φ = 7593071236.

The previous prime is 7758138043. The next prime is 7758138053. The reversal of 7758138049 is 9408318577.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7758138049 - 2⁹ = 7758137537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7758137987 and 7758138005.

It is not an unprimeable number, because it can be changed into a prime (7758138043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82533337 + ... + 82533430.

It is an arithmetic number, because the mean of its divisors is an integer number (1980801216).

Almost surely, 2^7758138049 is an apocalyptic number.

It is an amenable number.

7758138049 is a deficient number, since it is larger than the sum of its proper divisors (165066815).

7758138049 is a wasteful number, since it uses less digits than its factorization.

7758138049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165066814.

The product of its (nonzero) digits is 1693440, while the sum is 52.

The square root of 7758138049 is about 88080.2931931996. The cubic root of 7758138049 is about 1979.6382402883.

The spelling of 7758138049 in words is "seven billion, seven hundred fifty-eight million, one hundred thirty-eight thousand, forty-nine".