61641216001 has 4 divisors (see below), whose sum is σ = 61724628400. Its totient is φ = 61557803604.

The previous prime is 61641215981. The next prime is 61641216023. The reversal of 61641216001 is 10061214616.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61641216001 - 2²⁹ = 61104345089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61641216041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41705091 + ... + 41706568.

It is an arithmetic number, because the mean of its divisors is an integer number (15431157100).

Almost surely, 2^61641216001 is an apocalyptic number.

It is an amenable number.

61641216001 is a deficient number, since it is larger than the sum of its proper divisors (83412399).

61641216001 is an equidigital number, since it uses as much as digits as its factorization.

61641216001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83412398.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 61641216001 in words is "sixty-one billion, six hundred forty-one million, two hundred sixteen thousand, one".