642157751246 has 8 divisors (see below), whose sum is σ = 1050803592984. Its totient is φ = 291889886920.

The previous prime is 642157751203. The next prime is 642157751251.

It is a happy number.

642157751246 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×642157751246² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 642157751194 and 642157751203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14594494325 + ... + 14594494368.

It is an arithmetic number, because the mean of its divisors is an integer number (131350449123).

Almost surely, 2^642157751246 is an apocalyptic number.

642157751246 is a deficient number, since it is larger than the sum of its proper divisors (408645841738).

642157751246 is a wasteful number, since it uses less digits than its factorization.

642157751246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29188988706.

The product of its digits is 2822400, while the sum is 50.

The spelling of 642157751246 in words is "six hundred forty-two billion, one hundred fifty-seven million, seven hundred fifty-one thousand, two hundred forty-six".