65949771508 has 36 divisors (see below), whose sum is σ = 126436739940. Its totient is φ = 29959826176.

The previous prime is 65949771493. The next prime is 65949771557. The reversal of 65949771508 is 80517794956.

It can be written as a sum of positive squares in 2 ways, for example, as 43342243344 + 22607528164 = 208188^2 + 150358^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11401185 + ... + 11406967.

It is an arithmetic number, because the mean of its divisors is an integer number (3512131665).

Almost surely, 2^65949771508 is an apocalyptic number.

65949771508 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

65949771508 is a deficient number, since it is larger than the sum of its proper divisors (60486968432).

65949771508 is an equidigital number, since it uses as much as digits as its factorization.

65949771508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11616 (or 5831 counting only the distinct ones).

The product of its (nonzero) digits is 19051200, while the sum is 61.

The spelling of 65949771508 in words is "sixty-five billion, nine hundred forty-nine million, seven hundred seventy-one thousand, five hundred eight".