61452681971 has 4 divisors (see below), whose sum is σ = 63571740000. Its totient is φ = 59333623944.

The previous prime is 61452681947. The next prime is 61452681973. The reversal of 61452681971 is 17918625416.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61452681971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61452681973) 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, 1059528971 + ... + 1059529028.

It is an arithmetic number, because the mean of its divisors is an integer number (15892935000).

Almost surely, 2^61452681971 is an apocalyptic number.

61452681971 is a deficient number, since it is larger than the sum of its proper divisors (2119058029).

61452681971 is a wasteful number, since it uses less digits than its factorization.

61452681971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2119058028.

The product of its digits is 725760, while the sum is 50.

The spelling of 61452681971 in words is "sixty-one billion, four hundred fifty-two million, six hundred eighty-one thousand, nine hundred seventy-one".