61648372553 has 4 divisors (see below), whose sum is σ = 64893023760. Its totient is φ = 58403721348.

The previous prime is 61648372537. The next prime is 61648372559. The reversal of 61648372553 is 35527384616.

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 61648372553 - 2⁴ = 61648372537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61648372559) 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, 1622325575 + ... + 1622325612.

It is an arithmetic number, because the mean of its divisors is an integer number (16223255940).

Almost surely, 2^61648372553 is an apocalyptic number.

It is an amenable number.

61648372553 is a deficient number, since it is larger than the sum of its proper divisors (3244651207).

61648372553 is a wasteful number, since it uses less digits than its factorization.

61648372553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3244651206.

The product of its digits is 3628800, while the sum is 50.

The spelling of 61648372553 in words is "sixty-one billion, six hundred forty-eight million, three hundred seventy-two thousand, five hundred fifty-three".