42565121651 has 4 divisors (see below), whose sum is σ = 45839361792. Its totient is φ = 39290881512.

The previous prime is 42565121629. The next prime is 42565121681. The reversal of 42565121651 is 15612156524.

42565121651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42565121651 - 2⁶ = 42565121587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42565121681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1637120051 + ... + 1637120076.

It is an arithmetic number, because the mean of its divisors is an integer number (11459840448).

Almost surely, 2^42565121651 is an apocalyptic number.

42565121651 is a deficient number, since it is larger than the sum of its proper divisors (3274240141).

42565121651 is a wasteful number, since it uses less digits than its factorization.

42565121651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3274240140.

The product of its digits is 72000, while the sum is 38.

The spelling of 42565121651 in words is "forty-two billion, five hundred sixty-five million, one hundred twenty-one thousand, six hundred fifty-one".