642099671 has 12 divisors (see below), whose sum is σ = 675080280. Its totient is φ = 610661040.

The previous prime is 642099649. The next prime is 642099697. The reversal of 642099671 is 176990246.

It is not a de Polignac number, because 642099671 - 2¹⁰ = 642098647 is a prime.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642090671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91301 + ... + 98081.

It is an arithmetic number, because the mean of its divisors is an integer number (56256690).

Almost surely, 2^642099671 is an apocalyptic number.

642099671 is a deficient number, since it is larger than the sum of its proper divisors (32980609).

642099671 is a wasteful number, since it uses less digits than its factorization.

642099671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7006 (or 6983 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 642099671 is about 25339.6856926048. The cubic root of 642099671 is about 862.7152647878.

The spelling of 642099671 in words is "six hundred forty-two million, ninety-nine thousand, six hundred seventy-one".