61650661575571 has 4 divisors (see below), whose sum is σ = 61650726264232. Its totient is φ = 61650596886912.

The previous prime is 61650661575551. The next prime is 61650661575617. The reversal of 61650661575571 is 17557516605616.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61650661575571 - 2²³ = 61650653186963 is a prime.

It is a super-2 number, since 2×61650661575571² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61650661575551) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 30893070 + ... + 32828083.

It is an arithmetic number, because the mean of its divisors is an integer number (15412681566058).

Almost surely, 2^{61650661575571} is an apocalyptic number.

61650661575571 is a deficient number, since it is larger than the sum of its proper divisors (64688661).

61650661575571 is an equidigital number, since it uses as much as digits as its factorization.

61650661575571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64688660.

The product of its (nonzero) digits is 39690000, while the sum is 61.

The spelling of 61650661575571 in words is "sixty-one trillion, six hundred fifty billion, six hundred sixty-one million, five hundred seventy-five thousand, five hundred seventy-one".