64100615654561 has 4 divisors (see below), whose sum is σ = 64912015852800. Its totient is φ = 63289215456324.

The previous prime is 64100615654531. The next prime is 64100615654587. The reversal of 64100615654561 is 16545651600146.

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 64100615654561 - 2⁶ = 64100615654497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64100615654531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 405700099001 + ... + 405700099158.

It is an arithmetic number, because the mean of its divisors is an integer number (16228003963200).

Almost surely, 2^{64100615654561} is an apocalyptic number.

It is an amenable number.

64100615654561 is a deficient number, since it is larger than the sum of its proper divisors (811400198239).

64100615654561 is an equidigital number, since it uses as much as digits as its factorization.

64100615654561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811400198238.

The product of its (nonzero) digits is 2592000, while the sum is 50.

The spelling of 64100615654561 in words is "sixty-four trillion, one hundred billion, six hundred fifteen million, six hundred fifty-four thousand, five hundred sixty-one".