61486537919 has 4 divisors (see below), whose sum is σ = 61496302440. Its totient is φ = 61476773400.

The previous prime is 61486537867. The next prime is 61486537927. The reversal of 61486537919 is 91973568416.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61486537919 is a prime.

It is a super-2 number, since 2×61486537919² (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 (61486537969) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4872809 + ... + 4885410.

It is an arithmetic number, because the mean of its divisors is an integer number (15374075610).

Almost surely, 2^61486537919 is an apocalyptic number.

61486537919 is a deficient number, since it is larger than the sum of its proper divisors (9764521).

61486537919 is an equidigital number, since it uses as much as digits as its factorization.

61486537919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9764520.

The product of its digits is 9797760, while the sum is 59.

The spelling of 61486537919 in words is "sixty-one billion, four hundred eighty-six million, five hundred thirty-seven thousand, nine hundred nineteen".