65191972 has 6 divisors (see below), whose sum is σ = 114085958. Its totient is φ = 32595984.

The previous prime is 65191967. The next prime is 65192003. The reversal of 65191972 is 27919156.

It can be written as a sum of positive squares in only one way, i.e., 46321636 + 18870336 = 6806^2 + 4344^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8148993 + ... + 8149000.

Almost surely, 2^65191972 is an apocalyptic number.

It is an amenable number.

65191972 is a deficient number, since it is larger than the sum of its proper divisors (48893986).

65191972 is a wasteful number, since it uses less digits than its factorization.

65191972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16297997 (or 16297995 counting only the distinct ones).

The product of its digits is 34020, while the sum is 40.

The square root of 65191972 is about 8074.1545687459. The cubic root of 65191972 is about 402.4680159249.

The spelling of 65191972 in words is "sixty-five million, one hundred ninety-one thousand, nine hundred seventy-two".