65809955 has 4 divisors (see below), whose sum is σ = 78971952. Its totient is φ = 52647960.

The previous prime is 65809951. The next prime is 65809963. The reversal of 65809955 is 55990856.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 65809955 - 2² = 65809951 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65809951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6580991 + ... + 6581000.

It is an arithmetic number, because the mean of its divisors is an integer number (19742988).

Almost surely, 2^65809955 is an apocalyptic number.

65809955 is a deficient number, since it is larger than the sum of its proper divisors (13161997).

65809955 is a wasteful number, since it uses less digits than its factorization.

65809955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13161996.

The product of its (nonzero) digits is 486000, while the sum is 47.

The square root of 65809955 is about 8112.3335113887. Note that the first 3 decimals coincide. The cubic root of 65809955 is about 403.7357415560.

The spelling of 65809955 in words is "sixty-five million, eight hundred nine thousand, nine hundred fifty-five".