1020011209978 has 4 divisors (see below), whose sum is σ = 1530016814970. Its totient is φ = 510005604988.

The previous prime is 1020011209853. The next prime is 1020011209993. The reversal of 1020011209978 is 8799021100201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 825250515489 + 194760694489 = 908433^2 + 441317^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1020011209978.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255002802493 + ... + 255002802496.

Almost surely, 2^{1020011209978} is an apocalyptic number.

1020011209978 is a deficient number, since it is larger than the sum of its proper divisors (510005604992).

1020011209978 is an equidigital number, since it uses as much as digits as its factorization.

1020011209978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510005604991.

The product of its (nonzero) digits is 18144, while the sum is 40.

The spelling of 1020011209978 in words is "one trillion, twenty billion, eleven million, two hundred nine thousand, nine hundred seventy-eight".