65698395840 has 1792 divisors, whose sum is σ = 316227317760. Its totient is φ = 12421693440.

The previous prime is 65698395827. The next prime is 65698395899. The reversal of 65698395840 is 4859389656.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 418461042 + ... + 418461198.

Almost surely, 2^65698395840 is an apocalyptic number.

65698395840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65698395840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158113658880).

65698395840 is an abundant number, since it is smaller than the sum of its proper divisors (250528921920).

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

65698395840 is a wasteful number, since it uses less digits than its factorization.

65698395840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 55987200, while the sum is 63.

The spelling of 65698395840 in words is "sixty-five billion, six hundred ninety-eight million, three hundred ninety-five thousand, eight hundred forty".