61687375633 has 72 divisors (see below), whose sum is σ = 72798840576. Its totient is φ = 52151299200.

The previous prime is 61687375573. The next prime is 61687375637. The reversal of 61687375633 is 33657378616.

It is not a de Polignac number, because 61687375633 - 2³³ = 53097441041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61687375637) 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 71 ways as a sum of consecutive naturals, for example, 920707066 + ... + 920707132.

It is an arithmetic number, because the mean of its divisors is an integer number (1011095008).

Almost surely, 2^61687375633 is an apocalyptic number.

It is an amenable number.

61687375633 is a deficient number, since it is larger than the sum of its proper divisors (11111464943).

61687375633 is a wasteful number, since it uses less digits than its factorization.

61687375633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295 (or 215 counting only the distinct ones).

The product of its digits is 11430720, while the sum is 55.

The spelling of 61687375633 in words is "sixty-one billion, six hundred eighty-seven million, three hundred seventy-five thousand, six hundred thirty-three".