65642051 has 4 divisors (see below), whose sum is σ = 67905600. Its totient is φ = 63378504.

The previous prime is 65642041. The next prime is 65642053. The reversal of 65642051 is 15024656.

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

It is a cyclic number.

It is not a de Polignac number, because 65642051 - 2¹⁸ = 65379907 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 2263519 = 65642051 / (6 + 5 + 6 + 4 + 2 + 0 + 5 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65642053) 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, 1131731 + ... + 1131788.

It is an arithmetic number, because the mean of its divisors is an integer number (16976400).

Almost surely, 2^65642051 is an apocalyptic number.

65642051 is a deficient number, since it is larger than the sum of its proper divisors (2263549).

65642051 is a wasteful number, since it uses less digits than its factorization.

65642051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2263548.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 65642051 is about 8101.9782152262. The cubic root of 65642051 is about 403.3920925405.

The spelling of 65642051 in words is "sixty-five million, six hundred forty-two thousand, fifty-one".