749749779989 has 4 divisors (see below), whose sum is σ = 856856891424. Its totient is φ = 642642668556.

The previous prime is 749749779973. The next prime is 749749779991. The reversal of 749749779989 is 989977947947.

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, and also an emirpimes, since its reverse is a distinct semiprime: 989977947947 = 352399 ⋅2809253.

It is not a de Polignac number, because 749749779989 - 2⁴ = 749749779973 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 (749749779949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53553555707 + ... + 53553555720.

It is an arithmetic number, because the mean of its divisors is an integer number (214214222856).

Almost surely, 2^749749779989 is an apocalyptic number.

It is an amenable number.

749749779989 is a deficient number, since it is larger than the sum of its proper divisors (107107111435).

749749779989 is a wasteful number, since it uses less digits than its factorization.

749749779989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107107111434.

The product of its digits is 18147411072, while the sum is 89.

The spelling of 749749779989 in words is "seven hundred forty-nine billion, seven hundred forty-nine million, seven hundred seventy-nine thousand, nine hundred eighty-nine".