61345908919 has 2 divisors, whose sum is σ = 61345908920. Its totient is φ = 61345908918.

The previous prime is 61345908859. The next prime is 61345908929. The reversal of 61345908919 is 91980954316.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61345908919 - 2²³ = 61337520311 is a prime.

It is a super-2 number, since 2×61345908919² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61345908919.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61345908929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30672954459 + 30672954460.

It is an arithmetic number, because the mean of its divisors is an integer number (30672954460).

Almost surely, 2^61345908919 is an apocalyptic number.

61345908919 is a deficient number, since it is larger than the sum of its proper divisors (1).

61345908919 is an equidigital number, since it uses as much as digits as its factorization.

61345908919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2099520, while the sum is 55.

The spelling of 61345908919 in words is "sixty-one billion, three hundred forty-five million, nine hundred eight thousand, nine hundred nineteen".