642850265511 has 20 divisors (see below), whose sum is σ = 962216407152. Its totient is φ = 427714795008.

The previous prime is 642850265459. The next prime is 642850265521. The reversal of 642850265511 is 115562058246.

642850265511 is a `hidden beast` number, since 6 + 4 + 28 + 50 + 2 + 65 + 511 = 666.

It is not a de Polignac number, because 642850265511 - 2¹⁰ = 642850264487 is a prime.

It is a super-2 number, since 2×642850265511² (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 (642850265521) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7848346 + ... + 7929831.

Almost surely, 2^642850265511 is an apocalyptic number.

642850265511 is a deficient number, since it is larger than the sum of its proper divisors (319366141641).

642850265511 is a wasteful number, since it uses less digits than its factorization.

642850265511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15778692 (or 15778683 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 45.

The spelling of 642850265511 in words is "six hundred forty-two billion, eight hundred fifty million, two hundred sixty-five thousand, five hundred eleven".