749138867647 has 4 divisors (see below), whose sum is σ = 759690119376. Its totient is φ = 738587615920.

The previous prime is 749138867639. The next prime is 749138867657. The reversal of 749138867647 is 746768831947.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 746768831947 = 211 ⋅3539188777.

It is a cyclic number.

It is not a de Polignac number, because 749138867647 - 2³ = 749138867639 is a prime.

It is a super-2 number, since 2×749138867647² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (749138867657) 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, 5275625758 + ... + 5275625899.

It is an arithmetic number, because the mean of its divisors is an integer number (189922529844).

Almost surely, 2^749138867647 is an apocalyptic number.

749138867647 is a deficient number, since it is larger than the sum of its proper divisors (10551251729).

749138867647 is a wasteful number, since it uses less digits than its factorization.

749138867647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10551251728.

The product of its digits is 341397504, while the sum is 70.

The spelling of 749138867647 in words is "seven hundred forty-nine billion, one hundred thirty-eight million, eight hundred sixty-seven thousand, six hundred forty-seven".