75651765649 has 4 divisors (see below), whose sum is σ = 75654768420. Its totient is φ = 75648762880.

The previous prime is 75651765643. The next prime is 75651765659. The reversal of 75651765649 is 94656715657.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12647251600 + 63004514049 = 112460^2 + 251007^2 .

It is a cyclic number.

It is not a de Polignac number, because 75651765649 - 2²³ = 75643377041 is a prime.

It is a super-2 number, since 2×75651765649² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75651765643) 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, 1463272 + ... + 1514089.

It is an arithmetic number, because the mean of its divisors is an integer number (18913692105).

Almost surely, 2^75651765649 is an apocalyptic number.

It is an amenable number.

75651765649 is a deficient number, since it is larger than the sum of its proper divisors (3002771).

75651765649 is a wasteful number, since it uses less digits than its factorization.

75651765649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3002770.

The product of its digits is 47628000, while the sum is 61.

The spelling of 75651765649 in words is "seventy-five billion, six hundred fifty-one million, seven hundred sixty-five thousand, six hundred forty-nine".