61650131211 has 20 divisors (see below), whose sum is σ = 93044081592. Its totient is φ = 40676370048.

The previous prime is 61650131171. The next prime is 61650131281. The reversal of 61650131211 is 11213105616.

61650131211 is a `hidden beast` number, since 6 + 1 + 650 + 1 + 3 + 1 + 2 + 1 + 1 = 666.

It is not a de Polignac number, because 61650131211 - 2¹⁸ = 61649869067 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (61650131281) 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 in 19 ways as a sum of consecutive naturals, for example, 3915405 + ... + 3931118.

Almost surely, 2^61650131211 is an apocalyptic number.

61650131211 is a deficient number, since it is larger than the sum of its proper divisors (31393950381).

61650131211 is an equidigital number, since it uses as much as digits as its factorization.

61650131211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7846632 (or 7846623 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

Adding to 61650131211 its reverse (11213105616), we get a palindrome (72863236827).

The spelling of 61650131211 in words is "sixty-one billion, six hundred fifty million, one hundred thirty-one thousand, two hundred eleven".