61172944449 has 16 divisors (see below), whose sum is σ = 86429524608. Its totient is φ = 38352925952.

The previous prime is 61172944403. The next prime is 61172944463. The reversal of 61172944449 is 94444927116.

It is a cyclic number.

It is not a de Polignac number, because 61172944449 - 2⁷ = 61172944321 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (61172944249) 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, 404517 + ... + 534770.

It is an arithmetic number, because the mean of its divisors is an integer number (5401845288).

Almost surely, 2^61172944449 is an apocalyptic number.

It is an amenable number.

61172944449 is a deficient number, since it is larger than the sum of its proper divisors (25256580159).

61172944449 is a wasteful number, since it uses less digits than its factorization.

61172944449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940584.

The product of its digits is 1741824, while the sum is 51.

The spelling of 61172944449 in words is "sixty-one billion, one hundred seventy-two million, nine hundred forty-four thousand, four hundred forty-nine".