61636440654123 has 4 divisors (see below), whose sum is σ = 82181920872168. Its totient is φ = 41090960436080.

The previous prime is 61636440653969. The next prime is 61636440654143. The reversal of 61636440654123 is 32145604463616.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61636440654123 - 2¹⁷ = 61636440523051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61636440654143) 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, 10272740109018 + ... + 10272740109023.

It is an arithmetic number, because the mean of its divisors is an integer number (20545480218042).

Almost surely, 2^{61636440654123} is an apocalyptic number.

61636440654123 is a deficient number, since it is larger than the sum of its proper divisors (20545480218045).

61636440654123 is a wasteful number, since it uses less digits than its factorization.

61636440654123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20545480218044.

The product of its (nonzero) digits is 7464960, while the sum is 51.

The spelling of 61636440654123 in words is "sixty-one trillion, six hundred thirty-six billion, four hundred forty million, six hundred fifty-four thousand, one hundred twenty-three".