642217627451 has 8 divisors (see below), whose sum is σ = 654791084640. Its totient is φ = 629765653248.

The previous prime is 642217627417. The next prime is 642217627453. The reversal of 642217627451 is 154726712246.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642217627451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642217627396 and 642217627405.

It is not an unprimeable number, because it can be changed into a prime (642217627453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30360071 + ... + 30381216.

It is an arithmetic number, because the mean of its divisors is an integer number (81848885580).

Almost surely, 2^642217627451 is an apocalyptic number.

642217627451 is a deficient number, since it is larger than the sum of its proper divisors (12573457189).

642217627451 is a wasteful number, since it uses less digits than its factorization.

642217627451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60741493.

The product of its digits is 1128960, while the sum is 47.

The spelling of 642217627451 in words is "six hundred forty-two billion, two hundred seventeen million, six hundred twenty-seven thousand, four hundred fifty-one".