105642156442 has 8 divisors (see below), whose sum is σ = 162328191732. Its totient is φ = 51532759200.

The previous prime is 105642156413. The next prime is 105642156457. The reversal of 105642156442 is 244651246501.

It can be written as a sum of positive squares in 2 ways, for example, as 86677836921 + 18964319521 = 294411^2 + 137711^2 .

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

It is a super-2 number, since 2×105642156442² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 105642156395 and 105642156404.

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, 644159409 + ... + 644159572.

Almost surely, 2^105642156442 is an apocalyptic number.

105642156442 is a deficient number, since it is larger than the sum of its proper divisors (56686035290).

105642156442 is a wasteful number, since it uses less digits than its factorization.

105642156442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1288319024.

The product of its (nonzero) digits is 230400, while the sum is 40.

The spelling of 105642156442 in words is "one hundred five billion, six hundred forty-two million, one hundred fifty-six thousand, four hundred forty-two".