61452514581 has 4 divisors (see below), whose sum is σ = 81936686112. Its totient is φ = 40968343052.

The previous prime is 61452514577. The next prime is 61452514631. The reversal of 61452514581 is 18541525416.

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 a cyclic number.

It is not a de Polignac number, because 61452514581 - 2² = 61452514577 is a prime.

It is a super-2 number, since 2×61452514581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61452514561) 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, 10242085761 + ... + 10242085766.

It is an arithmetic number, because the mean of its divisors is an integer number (20484171528).

Almost surely, 2^61452514581 is an apocalyptic number.

It is an amenable number.

61452514581 is a deficient number, since it is larger than the sum of its proper divisors (20484171531).

61452514581 is a wasteful number, since it uses less digits than its factorization.

61452514581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20484171530.

The product of its digits is 192000, while the sum is 42.

The spelling of 61452514581 in words is "sixty-one billion, four hundred fifty-two million, five hundred fourteen thousand, five hundred eighty-one".