8461554008639 has 2 divisors, whose sum is σ = 8461554008640. Its totient is φ = 8461554008638.

The previous prime is 8461554008617. The next prime is 8461554008647. The reversal of 8461554008639 is 9368004551648.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8461554008639 is a prime.

It is a super-2 number, since 2×8461554008639² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8461554008539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4230777004319 + 4230777004320.

It is an arithmetic number, because the mean of its divisors is an integer number (4230777004320).

Almost surely, 2^{8461554008639} is an apocalyptic number.

8461554008639 is a deficient number, since it is larger than the sum of its proper divisors (1).

8461554008639 is an equidigital number, since it uses as much as digits as its factorization.

8461554008639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24883200, while the sum is 59.

The spelling of 8461554008639 in words is "eight trillion, four hundred sixty-one billion, five hundred fifty-four million, eight thousand, six hundred thirty-nine".