61143449919 has 8 divisors (see below), whose sum is σ = 81587753472. Its totient is φ = 40730723160.

The previous prime is 61143449897. The next prime is 61143449929. The reversal of 61143449919 is 91994434116.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61143449919 - 2²⁴ = 61126672703 is a prime.

It is a super-2 number, since 2×61143449919² (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 (61143449929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7889679 + ... + 7897424.

It is an arithmetic number, because the mean of its divisors is an integer number (10198469184).

Almost surely, 2^61143449919 is an apocalyptic number.

61143449919 is a deficient number, since it is larger than the sum of its proper divisors (20444303553).

61143449919 is a wasteful number, since it uses less digits than its factorization.

61143449919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15788397.

The product of its digits is 839808, while the sum is 51.

The spelling of 61143449919 in words is "sixty-one billion, one hundred forty-three million, four hundred forty-nine thousand, nine hundred nineteen".