61255553633 has 4 divisors (see below), whose sum is σ = 64479530160. Its totient is φ = 58031577108.

The previous prime is 61255553617. The next prime is 61255553647. The reversal of 61255553633 is 33635555216.

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 not a de Polignac number, because 61255553633 - 2⁴ = 61255553617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61255550633) 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, 1611988235 + ... + 1611988272.

It is an arithmetic number, because the mean of its divisors is an integer number (16119882540).

Almost surely, 2^61255553633 is an apocalyptic number.

It is an amenable number.

61255553633 is a deficient number, since it is larger than the sum of its proper divisors (3223976527).

61255553633 is a wasteful number, since it uses less digits than its factorization.

61255553633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3223976526.

The product of its digits is 1215000, while the sum is 44.

The spelling of 61255553633 in words is "sixty-one billion, two hundred fifty-five million, five hundred fifty-three thousand, six hundred thirty-three".