2142539920778 has 16 divisors (see below), whose sum is σ = 3217296605256. Its totient is φ = 1070108340480.

The previous prime is 2142539920757. The next prime is 2142539920811. The reversal of 2142539920778 is 8770299352412.

It can be written as a sum of positive squares in 4 ways, for example, as 1986867850969 + 155672069809 = 1409563^2 + 394553^2 .

It is a super-2 number, since 2×2142539920778² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6826550 + ... + 7133502.

Almost surely, 2^{2142539920778} is an apocalyptic number.

2142539920778 is a deficient number, since it is larger than the sum of its proper divisors (1074756684478).

2142539920778 is a wasteful number, since it uses less digits than its factorization.

2142539920778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310729.

The product of its (nonzero) digits is 15240960, while the sum is 59.

The spelling of 2142539920778 in words is "two trillion, one hundred forty-two billion, five hundred thirty-nine million, nine hundred twenty thousand, seven hundred seventy-eight".