65494737520 has 20 divisors (see below), whose sum is σ = 152275264920. Its totient is φ = 26197894976.

The previous prime is 65494737479. The next prime is 65494737577. The reversal of 65494737520 is 2573749456.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 409342030 + ... + 409342189.

It is an arithmetic number, because the mean of its divisors is an integer number (7613763246).

Almost surely, 2^65494737520 is an apocalyptic number.

It is an amenable number.

65494737520 is an abundant number, since it is smaller than the sum of its proper divisors (86780527400).

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

65494737520 is a wasteful number, since it uses less digits than its factorization.

65494737520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818684232 (or 818684226 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 52.

The spelling of 65494737520 in words is "sixty-five billion, four hundred ninety-four million, seven hundred thirty-seven thousand, five hundred twenty".