2001156356254 has 32 divisors (see below), whose sum is σ = 3417103895040. Its totient is φ = 870040063200.

The previous prime is 2001156356249. The next prime is 2001156356263. The reversal of 2001156356254 is 4526536511002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27804687 + ... + 27876565.

It is an arithmetic number, because the mean of its divisors is an integer number (106784496720).

Almost surely, 2^{2001156356254} is an apocalyptic number.

2001156356254 is a deficient number, since it is larger than the sum of its proper divisors (1415947538786).

2001156356254 is a wasteful number, since it uses less digits than its factorization.

2001156356254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126936.

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 2001156356254 in words is "two trillion, one billion, one hundred fifty-six million, three hundred fifty-six thousand, two hundred fifty-four".