1000643551401 has 16 divisors (see below), whose sum is σ = 1438534097280. Its totient is φ = 615046680960.

The previous prime is 1000643551381. The next prime is 1000643551489. The reversal of 1000643551401 is 1041553460001.

It is a happy number.

It is not a de Polignac number, because 1000643551401 - 2²¹ = 1000641454249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1000643559401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15257820 + ... + 15323261.

It is an arithmetic number, because the mean of its divisors is an integer number (89908381080).

Almost surely, 2^{1000643551401} is an apocalyptic number.

It is an amenable number.

1000643551401 is a deficient number, since it is larger than the sum of its proper divisors (437890545879).

1000643551401 is a wasteful number, since it uses less digits than its factorization.

1000643551401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30581936.

The product of its (nonzero) digits is 7200, while the sum is 30.

The spelling of 1000643551401 in words is "one trillion, six hundred forty-three million, five hundred fifty-one thousand, four hundred one".