42856215320415 has 16 divisors (see below), whose sum is σ = 78365650871808. Its totient is φ = 19591412717856.

The previous prime is 42856215320411. The next prime is 42856215320423. The reversal of 42856215320415 is 51402351265824.

It is a happy number.

It is not a de Polignac number, because 42856215320415 - 2² = 42856215320411 is a prime.

It is a super-2 number, since 2×42856215320415² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42856215320411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204077215707 + ... + 204077215916.

It is an arithmetic number, because the mean of its divisors is an integer number (4897853179488).

Almost surely, 2^{42856215320415} is an apocalyptic number.

42856215320415 is a deficient number, since it is larger than the sum of its proper divisors (35509435551393).

42856215320415 is a wasteful number, since it uses less digits than its factorization.

42856215320415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408154431638.

The product of its (nonzero) digits is 2304000, while the sum is 48.

The spelling of 42856215320415 in words is "forty-two trillion, eight hundred fifty-six billion, two hundred fifteen million, three hundred twenty thousand, four hundred fifteen".