1610858603381 has 2 divisors, whose sum is σ = 1610858603382. Its totient is φ = 1610858603380.

The previous prime is 1610858603371. The next prime is 1610858603461. The reversal of 1610858603381 is 1833068580161.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1526729600881 + 84129002500 = 1235609^2 + 290050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1610858603381 is a prime.

It is a super-2 number, since 2×1610858603381² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1610858603311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805429301690 + 805429301691.

It is an arithmetic number, because the mean of its divisors is an integer number (805429301691).

Almost surely, 2^{1610858603381} is an apocalyptic number.

It is an amenable number.

1610858603381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1610858603381 is an equidigital number, since it uses as much as digits as its factorization.

1610858603381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 829440, while the sum is 50.

The spelling of 1610858603381 in words is "one trillion, six hundred ten billion, eight hundred fifty-eight million, six hundred three thousand, three hundred eighty-one".