65661501510 has 48 divisors (see below), whose sum is σ = 186239898000. Its totient is φ = 15917939520.

The previous prime is 65661501467. The next prime is 65661501523. The reversal of 65661501510 is 1510516656.

It is a super-2 number, since 2×65661501510² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33161385 + ... + 33163364.

It is an arithmetic number, because the mean of its divisors is an integer number (3879997875).

Almost surely, 2^65661501510 is an apocalyptic number.

65661501510 is an abundant number, since it is smaller than the sum of its proper divisors (120578396490).

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

65661501510 is a wasteful number, since it uses less digits than its factorization.

65661501510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66324773 (or 66324770 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 65661501510 in words is "sixty-five billion, six hundred sixty-one million, five hundred one thousand, five hundred ten".