1978151860033 has 2 divisors, whose sum is σ = 1978151860034. Its totient is φ = 1978151860032.

The previous prime is 1978151860019. The next prime is 1978151860141. The reversal of 1978151860033 is 3300681518791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1946742096049 + 31409763984 = 1395257^2 + 177228^2 .

It is an emirp because it is prime and its reverse (3300681518791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1978151860033 - 2⁵ = 1978151860001 is a prime.

It is a super-2 number, since 2×1978151860033² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1978151870033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989075930016 + 989075930017.

It is an arithmetic number, because the mean of its divisors is an integer number (989075930017).

Almost surely, 2^{1978151860033} is an apocalyptic number.

It is an amenable number.

1978151860033 is a deficient number, since it is larger than the sum of its proper divisors (1).

1978151860033 is an equidigital number, since it uses as much as digits as its factorization.

1978151860033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The spelling of 1978151860033 in words is "one trillion, nine hundred seventy-eight billion, one hundred fifty-one million, eight hundred sixty thousand, thirty-three".