61634972875 has 16 divisors (see below), whose sum is σ = 87909082560. Its totient is φ = 42263980800.

The previous prime is 61634972873. The next prime is 61634972887. The reversal of 61634972875 is 57827943616.

It is not a de Polignac number, because 61634972875 - 2¹ = 61634972873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61634972873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35219110 + ... + 35220859.

It is an arithmetic number, because the mean of its divisors is an integer number (5494317660).

Almost surely, 2^61634972875 is an apocalyptic number.

61634972875 is a deficient number, since it is larger than the sum of its proper divisors (26274109685).

61634972875 is an equidigital number, since it uses as much as digits as its factorization.

61634972875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70439991 (or 70439981 counting only the distinct ones).

The product of its digits is 15240960, while the sum is 58.

The spelling of 61634972875 in words is "sixty-one billion, six hundred thirty-four million, nine hundred seventy-two thousand, eight hundred seventy-five".