643662125587 has 8 divisors (see below), whose sum is σ = 693194204304. Its totient is φ = 594132847968.

The previous prime is 643662125573. The next prime is 643662125593. The reversal of 643662125587 is 785521266346.

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

It is a cyclic number.

It is not a de Polignac number, because 643662125587 - 2¹⁵ = 643662092819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643662120587) 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, 210313 + ... + 1153930.

It is an arithmetic number, because the mean of its divisors is an integer number (86649275538).

Almost surely, 2^643662125587 is an apocalyptic number.

643662125587 is a deficient number, since it is larger than the sum of its proper divisors (49532078717).

643662125587 is a wasteful number, since it uses less digits than its factorization.

643662125587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1400549.

The product of its digits is 14515200, while the sum is 55.

The spelling of 643662125587 in words is "six hundred forty-three billion, six hundred sixty-two million, one hundred twenty-five thousand, five hundred eighty-seven".