61653543461 has 4 divisors (see below), whose sum is σ = 61662808800. Its totient is φ = 61644278124.

The previous prime is 61653543437. The next prime is 61653543503. The reversal of 61653543461 is 16434535616.

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 61653543461 - 2¹⁰ = 61653542437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61653543361) 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, 4622681 + ... + 4635998.

It is an arithmetic number, because the mean of its divisors is an integer number (15415702200).

Almost surely, 2^61653543461 is an apocalyptic number.

It is an amenable number.

61653543461 is a deficient number, since it is larger than the sum of its proper divisors (9265339).

61653543461 is an equidigital number, since it uses as much as digits as its factorization.

61653543461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9265338.

The product of its digits is 777600, while the sum is 44.

The spelling of 61653543461 in words is "sixty-one billion, six hundred fifty-three million, five hundred forty-three thousand, four hundred sixty-one".