61415208919 has 4 divisors (see below), whose sum is σ = 61452052344. Its totient is φ = 61378365496.

The previous prime is 61415208889. The next prime is 61415208941. The reversal of 61415208919 is 91980251416.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 61415208919 - 2¹³ = 61415200727 is a prime.

It is a super-2 number, since 2×61415208919² (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 (61415208979) 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, 18419212 + ... + 18422545.

It is an arithmetic number, because the mean of its divisors is an integer number (15363013086).

Almost surely, 2^61415208919 is an apocalyptic number.

61415208919 is a deficient number, since it is larger than the sum of its proper divisors (36843425).

61415208919 is a wasteful number, since it uses less digits than its factorization.

61415208919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36843424.

The product of its (nonzero) digits is 155520, while the sum is 46.

The spelling of 61415208919 in words is "sixty-one billion, four hundred fifteen million, two hundred eight thousand, nine hundred nineteen".