65987987760570 has 128 divisors (see below), whose sum is σ = 165931217436672. Its totient is φ = 16773849100800.

The previous prime is 65987987760547. The next prime is 65987987760631. The reversal of 65987987760570 is 7506778978956.

It is a happy number.

It is a super-2 number, since 2×65987987760570² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1278637707 + ... + 1278689313.

It is an arithmetic number, because the mean of its divisors is an integer number (1296337636224).

Almost surely, 2^{65987987760570} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65987987760570, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82965608718336).

65987987760570 is an abundant number, since it is smaller than the sum of its proper divisors (99943229676102).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65987987760570 is a wasteful number, since it uses less digits than its factorization.

65987987760570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72236.

The product of its (nonzero) digits is 11202105600, while the sum is 84.

The spelling of 65987987760570 in words is "sixty-five trillion, nine hundred eighty-seven billion, nine hundred eighty-seven million, seven hundred sixty thousand, five hundred seventy".