1655415905881 has 2 divisors, whose sum is σ = 1655415905882. Its totient is φ = 1655415905880.

The previous prime is 1655415905863. The next prime is 1655415905953. The reversal of 1655415905881 is 1885095145561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1284461822281 + 370954083600 = 1133341^2 + 609060^2 .

It is a cyclic number.

It is not a de Polignac number, because 1655415905881 - 2⁹ = 1655415905369 is a prime.

It is a super-2 number, since 2×1655415905881² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1655415905861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827707952940 + 827707952941.

It is an arithmetic number, because the mean of its divisors is an integer number (827707952941).

Almost surely, 2^{1655415905881} is an apocalyptic number.

It is an amenable number.

1655415905881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655415905881 is an equidigital number, since it uses as much as digits as its factorization.

1655415905881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640000, while the sum is 58.

The spelling of 1655415905881 in words is "one trillion, six hundred fifty-five billion, four hundred fifteen million, nine hundred five thousand, eight hundred eighty-one".