61540078919 has 8 divisors (see below), whose sum is σ = 67280265360. Its totient is φ = 55824164800.

The previous prime is 61540078909. The next prime is 61540078921. The reversal of 61540078919 is 91987004516.

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

It is a cyclic number.

It is not a de Polignac number, because 61540078919 - 2¹² = 61540074823 is a prime.

It is a super-2 number, since 2×61540078919² (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 (61540078909) 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, 6062774 + ... + 6072915.

It is an arithmetic number, because the mean of its divisors is an integer number (8410033170).

Almost surely, 2^61540078919 is an apocalyptic number.

61540078919 is a deficient number, since it is larger than the sum of its proper divisors (5740186441).

61540078919 is a wasteful number, since it uses less digits than its factorization.

61540078919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12136161.

The product of its (nonzero) digits is 544320, while the sum is 50.

The spelling of 61540078919 in words is "sixty-one billion, five hundred forty million, seventy-eight thousand, nine hundred nineteen".