61891544053 has 4 divisors (see below), whose sum is σ = 65148993760. Its totient is φ = 58634094348.

The previous prime is 61891543997. The next prime is 61891544069. The reversal of 61891544053 is 35044519816.

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 61891544053 - 2¹³ = 61891535861 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61891543994 and 61891544012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61891544653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1628724825 + ... + 1628724862.

It is an arithmetic number, because the mean of its divisors is an integer number (16287248440).

Almost surely, 2^61891544053 is an apocalyptic number.

It is an amenable number.

61891544053 is a deficient number, since it is larger than the sum of its proper divisors (3257449707).

61891544053 is a wasteful number, since it uses less digits than its factorization.

61891544053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3257449706.

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 61891544053 in words is "sixty-one billion, eight hundred ninety-one million, five hundred forty-four thousand, fifty-three".