65198881 has 8 divisors (see below), whose sum is σ = 71209728. Its totient is φ = 59202000.

The previous prime is 65198869. The next prime is 65198891. The reversal of 65198881 is 18889156.

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

It is not a de Polignac number, because 65198881 - 2⁵ = 65198849 is a prime.

It is a super-2 number, since 2×65198881² = 8501788167304322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65198801) 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, 7911 + ... + 13891.

It is an arithmetic number, because the mean of its divisors is an integer number (8901216).

Almost surely, 2^65198881 is an apocalyptic number.

It is an amenable number.

65198881 is a deficient number, since it is larger than the sum of its proper divisors (6010847).

65198881 is a wasteful number, since it uses less digits than its factorization.

65198881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6983.

The product of its digits is 138240, while the sum is 46.

The square root of 65198881 is about 8074.5824040628. The cubic root of 65198881 is about 402.4822331831.

It can be divided in two parts, 6519 and 8881, that added together give a triangular number (15400 = T₁₇₅).

The spelling of 65198881 in words is "sixty-five million, one hundred ninety-eight thousand, eight hundred eighty-one".