61894437519 has 4 divisors (see below), whose sum is σ = 82525916696. Its totient is φ = 41262958344.

The previous prime is 61894437503. The next prime is 61894437533. The reversal of 61894437519 is 91573449816.

It is a happy number.

61894437519 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 61894437519 - 2⁴ = 61894437503 is a prime.

It is a super-2 number, since 2×61894437519² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61894437559) 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, 10315739584 + ... + 10315739589.

It is an arithmetic number, because the mean of its divisors is an integer number (20631479174).

Almost surely, 2^61894437519 is an apocalyptic number.

61894437519 is a deficient number, since it is larger than the sum of its proper divisors (20631479177).

61894437519 is a wasteful number, since it uses less digits than its factorization.

61894437519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20631479176.

The product of its digits is 6531840, while the sum is 57.

The spelling of 61894437519 in words is "sixty-one billion, eight hundred ninety-four million, four hundred thirty-seven thousand, five hundred nineteen".