61662121005 has 16 divisors (see below), whose sum is σ = 100331588160. Its totient is φ = 32329066368.

The previous prime is 61662120977. The next prime is 61662121019. The reversal of 61662121005 is 50012126616.

It is not a de Polignac number, because 61662121005 - 2⁵ = 61662120973 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34836472 + ... + 34838241.

It is an arithmetic number, because the mean of its divisors is an integer number (6270724260).

Almost surely, 2^61662121005 is an apocalyptic number.

It is an amenable number.

61662121005 is a deficient number, since it is larger than the sum of its proper divisors (38669467155).

61662121005 is a wasteful number, since it uses less digits than its factorization.

61662121005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69674780.

The product of its (nonzero) digits is 4320, while the sum is 30.

The spelling of 61662121005 in words is "sixty-one billion, six hundred sixty-two million, one hundred twenty-one thousand, five".