642738063749 has 12 divisors (see below), whose sum is σ = 682859225664. Its totient is φ = 604851059904.

The previous prime is 642738063731. The next prime is 642738063797. The reversal of 642738063749 is 947360837246.

It is a de Polignac number, because none of the positive numbers 2^k-642738063749 is a prime.

It is a super-2 number, since 2×642738063749² (a number of 24 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 (642738060749) 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 11 ways as a sum of consecutive naturals, for example, 2137124 + ... + 2419250.

It is an arithmetic number, because the mean of its divisors is an integer number (56904935472).

Almost surely, 2^642738063749 is an apocalyptic number.

It is an amenable number.

642738063749 is a deficient number, since it is larger than the sum of its proper divisors (40121161915).

642738063749 is a wasteful number, since it uses less digits than its factorization.

642738063749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290044 (or 290027 counting only the distinct ones).

The product of its (nonzero) digits is 36578304, while the sum is 59.

The spelling of 642738063749 in words is "six hundred forty-two billion, seven hundred thirty-eight million, sixty-three thousand, seven hundred forty-nine".