61664111051 has 16 divisors (see below), whose sum is σ = 65878323840. Its totient is φ = 57550775040.

The previous prime is 61664111039. The next prime is 61664111057. The reversal of 61664111051 is 15011146616.

It is a de Polignac number, because none of the positive numbers 2^k-61664111051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61664110999 and 61664111017.

It is not an unprimeable number, because it can be changed into a prime (61664111057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 501296 + ... + 612066.

It is an arithmetic number, because the mean of its divisors is an integer number (4117395240).

Almost surely, 2^61664111051 is an apocalyptic number.

61664111051 is a deficient number, since it is larger than the sum of its proper divisors (4214212789).

61664111051 is a wasteful number, since it uses less digits than its factorization.

61664111051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111226.

The product of its (nonzero) digits is 4320, while the sum is 32.

Adding to 61664111051 its reverse (15011146616), we get a palindrome (76675257667).

The spelling of 61664111051 in words is "sixty-one billion, six hundred sixty-four million, one hundred eleven thousand, fifty-one".