642262501402 has 4 divisors (see below), whose sum is σ = 963393752106. Its totient is φ = 321131250700.

The previous prime is 642262501373. The next prime is 642262501411. The reversal of 642262501402 is 204105262246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 204105262246 = 2 ⋅102052631123.

It can be written as a sum of positive squares in only one way, i.e., 617231780881 + 25030720521 = 785641^2 + 158211^2 .

It is a super-2 number, since 2×642262501402² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160565625349 + ... + 160565625352.

Almost surely, 2^642262501402 is an apocalyptic number.

642262501402 is a deficient number, since it is larger than the sum of its proper divisors (321131250704).

642262501402 is a wasteful number, since it uses less digits than its factorization.

642262501402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321131250703.

The product of its (nonzero) digits is 46080, while the sum is 34.

Adding to 642262501402 its reverse (204105262246), we get a palindrome (846367763648).

The spelling of 642262501402 in words is "six hundred forty-two billion, two hundred sixty-two million, five hundred one thousand, four hundred two".