642994499246 has 24 divisors (see below), whose sum is σ = 1122505231680. Its totient is φ = 275077858880.

The previous prime is 642994499237. The next prime is 642994499249.

642994499246 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×642994499246² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642994499249) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78143006 + ... + 78151233.

It is an arithmetic number, because the mean of its divisors is an integer number (46771051320).

Almost surely, 2^642994499246 is an apocalyptic number.

642994499246 is a deficient number, since it is larger than the sum of its proper divisors (479510732434).

642994499246 is a wasteful number, since it uses less digits than its factorization.

642994499246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156294280 (or 156294269 counting only the distinct ones).

The product of its digits is 241864704, while the sum is 68.

The spelling of 642994499246 in words is "six hundred forty-two billion, nine hundred ninety-four million, four hundred ninety-nine thousand, two hundred forty-six".