42154659856 has 15 divisors (see below), whose sum is σ = 81676244701. Its totient is φ = 21076919296.

The previous prime is 42154659779. The next prime is 42154659857. The reversal of 42154659856 is 65895645124.

It is a happy number.

The square root of 42154659856 is 205316.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 37062410256 + 5092249600 = 192516^2 + 71360^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42154659797 and 42154659806.

It is not an unprimeable number, because it can be changed into a prime (42154659857) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 795600 + ... + 846928.

Almost surely, 2^42154659856 is an apocalyptic number.

42154659856 is the 205316-th square number.

It is an amenable number.

42154659856 is a deficient number, since it is larger than the sum of its proper divisors (39521584845).

42154659856 is an frugal number, since it uses more digits than its factorization.

42154659856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102666 (or 51331 counting only the distinct ones).

The product of its digits is 10368000, while the sum is 55.

The spelling of 42154659856 in words is "forty-two billion, one hundred fifty-four million, six hundred fifty-nine thousand, eight hundred fifty-six".