65611631 has 2 divisors, whose sum is σ = 65611632. Its totient is φ = 65611630.

The previous prime is 65611621. The next prime is 65611669. The reversal of 65611631 is 13611656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65611631 - 2¹⁰ = 65610607 is a prime.

It is a super-2 number, since 2×65611631² = 8609772244960322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 65611594 and 65611603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65611621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32805815 + 32805816.

It is an arithmetic number, because the mean of its divisors is an integer number (32805816).

Almost surely, 2^65611631 is an apocalyptic number.

65611631 is a deficient number, since it is larger than the sum of its proper divisors (1).

65611631 is an equidigital number, since it uses as much as digits as its factorization.

65611631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 29.

The square root of 65611631 is about 8100.1006783867. The cubic root of 65611631 is about 403.3297692617.

It can be divided in two parts, 6561 and 1631, that added together give a 13-th power (8192 = 2¹³).

The spelling of 65611631 in words is "sixty-five million, six hundred eleven thousand, six hundred thirty-one".