65490161 has 24 divisors (see below), whose sum is σ = 75701472. Its totient is φ = 56548800.

The previous prime is 65490157. The next prime is 65490163. The reversal of 65490161 is 16109456.

65490161 = 395² + 396² + ... + 636².

It is not a de Polignac number, because 65490161 - 2² = 65490157 is a prime.

It is a super-2 number, since 2×65490161² = 8577922375611842, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65490163) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 213170 + ... + 213476.

It is an arithmetic number, because the mean of its divisors is an integer number (3154228).

Almost surely, 2^65490161 is an apocalyptic number.

It is an amenable number.

65490161 is a deficient number, since it is larger than the sum of its proper divisors (10211311).

65490161 is a wasteful number, since it uses less digits than its factorization.

65490161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413 (or 402 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 65490161 is about 8092.5991498406. The cubic root of 65490161 is about 403.0807141704.

The spelling of 65490161 in words is "sixty-five million, four hundred ninety thousand, one hundred sixty-one".