749170221638 has 16 divisors (see below), whose sum is σ = 1133985303360. Its totient is φ = 371189851200.

The previous prime is 749170221619. The next prime is 749170221641. The reversal of 749170221638 is 836122071947.

It is a super-2 number, since 2×749170221638² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3580718 + ... + 3784161.

It is an arithmetic number, because the mean of its divisors is an integer number (70874081460).

Almost surely, 2^749170221638 is an apocalyptic number.

749170221638 is a deficient number, since it is larger than the sum of its proper divisors (384815081722).

749170221638 is a wasteful number, since it uses less digits than its factorization.

749170221638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7365343.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 749170221638 in words is "seven hundred forty-nine billion, one hundred seventy million, two hundred twenty-one thousand, six hundred thirty-eight".