61864808419 has 2 divisors, whose sum is σ = 61864808420. Its totient is φ = 61864808418.

The previous prime is 61864808399. The next prime is 61864808429. The reversal of 61864808419 is 91480846816.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61864808419 - 2⁵ = 61864808387 is a prime.

It is a super-2 number, since 2×61864808419² (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 61864808419.

It is not a weakly prime, because it can be changed into another prime (61864808429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30932404209 + 30932404210.

It is an arithmetic number, because the mean of its divisors is an integer number (30932404210).

Almost surely, 2^61864808419 is an apocalyptic number.

61864808419 is a deficient number, since it is larger than the sum of its proper divisors (1).

61864808419 is an equidigital number, since it uses as much as digits as its factorization.

61864808419 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2654208, while the sum is 55.

The spelling of 61864808419 in words is "sixty-one billion, eight hundred sixty-four million, eight hundred eight thousand, four hundred nineteen".