61725281445 has 16 divisors (see below), whose sum is σ = 109733833920. Its totient is φ = 32920150032.

The previous prime is 61725281393. The next prime is 61725281533. The reversal of 61725281445 is 54418252716.

61725281445 is a `hidden beast` number, since 6 + 1 + 72 + 528 + 14 + 45 = 666.

It is not a de Polignac number, because 61725281445 - 2¹⁴ = 61725265061 is a prime.

It is a super-2 number, since 2×61725281445² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61725281445.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 228612019 + ... + 228612288.

It is an arithmetic number, because the mean of its divisors is an integer number (6858364620).

Almost surely, 2^61725281445 is an apocalyptic number.

It is an amenable number.

61725281445 is a deficient number, since it is larger than the sum of its proper divisors (48008552475).

61725281445 is a wasteful number, since it uses less digits than its factorization.

61725281445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457224321 (or 457224315 counting only the distinct ones).

The product of its digits is 537600, while the sum is 45.

The spelling of 61725281445 in words is "sixty-one billion, seven hundred twenty-five million, two hundred eighty-one thousand, four hundred forty-five".