65191980 has 48 divisors (see below), whose sum is σ = 208615680. Its totient is φ = 14900928.

The previous prime is 65191967. The next prime is 65192003. The reversal of 65191980 is 8919156.

It is a zygodrome in base 11.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77190 + ... + 78029.

It is an arithmetic number, because the mean of its divisors is an integer number (4346160).

Almost surely, 2^65191980 is an apocalyptic number.

65191980 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65191980 is an abundant number, since it is smaller than the sum of its proper divisors (143423700).

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

65191980 is a wasteful number, since it uses less digits than its factorization.

65191980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155238 (or 155236 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 65191980 is about 8074.1550641538. The cubic root of 65191980 is about 402.4680323878.

The spelling of 65191980 in words is "sixty-five million, one hundred ninety-one thousand, nine hundred eighty".