1000629773978 has 4 divisors (see below), whose sum is σ = 1500944660970. Its totient is φ = 500314886988.

The previous prime is 1000629773971. The next prime is 1000629773987. The reversal of 1000629773978 is 8793779260001.

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., 878638145449 + 121991628529 = 937357^2 + 349273^2 .

It is not an unprimeable number, because it can be changed into a prime (1000629773971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250157443493 + ... + 250157443496.

Almost surely, 2^{1000629773978} is an apocalyptic number.

1000629773978 is a deficient number, since it is larger than the sum of its proper divisors (500314886992).

1000629773978 is an equidigital number, since it uses as much as digits as its factorization.

1000629773978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500314886991.

The product of its (nonzero) digits is 8001504, while the sum is 59.

The spelling of 1000629773978 in words is "one trillion, six hundred twenty-nine million, seven hundred seventy-three thousand, nine hundred seventy-eight".